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docs: create roadmap (6 phases)

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<!-- GSD:project-start source:PROJECT.md -->
## Project
**Tessera**
Tessera ist eine modulare, Docker-basierte Webplattform fuer interne Workflow-Automatisierung und Tool-Integration. Sie bietet ein Portal mit Seitenleiste, konfigurierbarem Dashboard und einem Marketplace fuer lizenzierbare Module. Perspektivisch soll Tessera auch an externe Kunden verkauft werden — Mandantenfaehigkeit ist von Anfang an eingeplant.
**Core Value:** Eine zentrale Plattform, in der beliebige Workflow-Tools als Module lizenziert, aktiviert und genutzt werden koennen — ohne zwischen verschiedenen Anwendungen wechseln zu muessen.
### Constraints
- **Infrastruktur**: Docker-basiert — alle Komponenten als Container
- **Datenbank**: PostgreSQL oder MariaDB (Entscheidung durch Claude)
- **Authentifizierung**: Initialer Admin-Account + manuelle Benutzerverwaltung + LDAP
- **Versionierung**: Automatisierte Gitea-Integration (minimaler manueller Aufwand)
- **Entwicklung**: Alles wird von Claude gebaut — Architektur muss wartbar und verstaendlich sein
- **Mandantenfaehigkeit**: Von Anfang an in der Architektur verankert
<!-- GSD:project-end -->
<!-- GSD:stack-start source:research/STACK.md -->
## Technology Stack
## Recommended Stack
### Monorepo & Package Management
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| pnpm | 9.x | Package manager | 60-80% disk reduction via content-addressable store, strict dependency isolation prevents phantom deps, workspace protocol for internal packages |
| Turborepo | 2.9.x | Build orchestration | Incremental builds, parallel execution, task dependency graph, caching. Vercel-maintained — aligns with Next.js ecosystem |
### Frontend
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| Next.js | 16.2.x | Frontend framework | App Router with React 19, Turbopack default bundler (4x faster builds), stable Server Components, `use cache` directive, multi-tenant middleware support |
| React | 19.x | UI library | Ships with Next.js 16, React Compiler (automatic memoization), stable Server Actions |
| TypeScript | 5.5+ | Type safety | Required by all major tools, catches bugs at compile time |
| Tailwind CSS | 4.3.x | Styling | CSS-first config (no JS config file), 3.5x faster rebuilds, OKLCH colors, built-in dark mode via `.dark` selector |
| shadcn/ui | CLI v4 | Component library | Not a dependency — copies components into your project. Accessible, themeable via CSS variables, dark/light mode trivial with next-themes. Dashboard-ready components |
| next-themes | 0.4.x | Theme switching | 2-line dark mode integration with shadcn/ui, SSR-safe, system preference detection |
| next-intl | 4.13.x | Internationalization | Built for Next.js App Router, Server Component native, 457 bytes gzipped, simpler than i18next for Next.js-only projects |
| react-grid-layout | 2.2.x | Dashboard grid | TypeScript rewrite with hooks API (useGridLayout, useResponsiveLayout), drag & drop + resize, responsive breakpoints, 100% backward compat via /legacy |
| Zustand | 5.0.x | Client state | Lightweight (1.1kb), no providers needed, works with Server Components, perfect for UI state (sidebar toggle, theme, user prefs) |
| TanStack Query | 5.101.x | Server state | Caching, background refresh, optimistic updates, pagination. Use for client-side data fetching where Server Components don't suffice |
### Backend
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| NestJS | 11.x | API framework | Modular architecture maps directly to Tessera's module system. Dependency injection, guards, interceptors, built-in microservices support. Modular monolith now, extract to microservices later if needed |
| Express | 5.x | HTTP server | Default in NestJS 11, battle-tested, massive middleware ecosystem |
| Prisma | 7.8.x | ORM | TypeScript-first, auto-generated types from schema, declarative migrations, Client Extensions for RLS multi-tenancy. v7 dropped Rust engine — 3x faster queries, 90% smaller bundles |
| PostgreSQL | 16.x | Database | Row-Level Security for multi-tenancy, JSONB for flexible module config, excellent Docker support, robust at any scale |
| Redis | 7.x | Cache & sessions | Session storage, pub/sub for real-time features, rate limiting, cache invalidation |
### Authentication & Authorization
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| Keycloak | 26.6.x | Identity provider | Native multi-tenancy via realms, LDAP/AD federation built-in, OAuth2/OIDC standard, Docker-native, admin UI included. Eliminates building auth from scratch |
| nest-keycloak-connect | latest | NestJS integration | Guards, decorators, multi-tenant realm resolvers — handles JWT validation and role extraction |
| @nestjs/passport | latest | Fallback auth | For API key auth on module-to-module communication |
### Desktop Wrapper
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| Tauri | 2.x (2.11+) | Desktop app | 5MB installer vs Electron's 150MB. Uses OS-native WebView — no bundled Chromium. Rust backend for system APIs. Windows + Linux supported. Perfect for wrapping an existing web app |
### Infrastructure & DevOps
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| Docker | 27.x | Containerization | Project constraint. Multi-stage builds for production images |
| Docker Compose | 2.x | Orchestration | Multi-service local dev and production deployment. Health checks, volume management, networking |
| Traefik | 3.x | Reverse proxy | Automatic SSL, Docker-native service discovery, routing rules via labels. Simpler than nginx for Docker-compose setups |
| Gitea | existing | Version control | Already in place. Automate via webhooks and Gitea API |
### Testing
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| Vitest | 3.x | Unit/integration tests | Fast, ESM-native, compatible with Jest API, works with both Next.js and NestJS |
| Playwright | 1.x | E2E tests | Cross-browser, auto-wait, trace viewer. Best for testing the full portal flow |
| Testing Library | latest | Component tests | DOM-based testing, framework-agnostic patterns |
### Developer Experience
| Technology | Version | Purpose | Why |
|------------|---------|---------|-----|
| Biome | 2.x | Linting + formatting | Single tool replaces ESLint + Prettier, 100x faster, zero-config defaults. Reduces tooling complexity |
| Husky | 9.x | Git hooks | Pre-commit formatting/linting enforcement |
| lint-staged | 15.x | Staged file linting | Only lint changed files for fast commits |
## Alternatives Considered
| Category | Recommended | Alternative | Why Not |
|----------|-------------|-------------|---------|
| Frontend Framework | Next.js 16 | Remix / SvelteKit | Next.js has best multi-tenant support, largest ecosystem, Vercel Platforms template as reference |
| Backend Framework | NestJS 11 | Fastify standalone / Express | NestJS module system maps perfectly to Tessera modules. DI, guards, and interceptors reduce boilerplate |
| ORM | Prisma 7 | Drizzle ORM | Prisma has gentler learning curve (built by Claude, non-programmer user), better migration safety. Drizzle is faster in serverless (irrelevant here — Docker deployment) |
| Database | PostgreSQL 16 | MariaDB | PostgreSQL has native RLS for multi-tenancy, superior JSONB support, better extension ecosystem |
| Auth | Keycloak | Custom JWT + LDAP lib | Building LDAP + multi-tenant auth from scratch is weeks of work and a security risk |
| Desktop | Tauri 2 | Electron | 96% smaller, 5x less memory. Tessera desktop is a wrapper, not a full desktop app |
| State | Zustand | Redux Toolkit | Zustand is 7x smaller bundle, no boilerplate, no providers. Redux is overkill for this project |
| i18n | next-intl | react-i18next | next-intl is built for App Router, Server Component native, simpler API |
| CSS | Tailwind 4 | CSS Modules / Styled Components | Utility-first is faster to develop, dark mode trivial, shadcn/ui requires it |
| Package Manager | pnpm | npm / yarn | pnpm has strict isolation, better disk usage, workspace support built-in |
| Monorepo Tool | Turborepo | Nx | Turborepo is simpler, aligns with Vercel ecosystem, sufficient for this project size |
| Linting | Biome | ESLint + Prettier | Single tool, 100x faster, less config. ESLint is being replaced in NestJS 12 roadmap anyway |
| Component Library | shadcn/ui | Material UI / Ant Design | shadcn gives ownership of components (no dep lock-in), built on Radix primitives, Tailwind-native |
| Dashboard Grid | react-grid-layout | Gridstack.js | React-native, TypeScript rewrite in v2, hooks API, responsive breakpoints |
| Reverse Proxy | Traefik | nginx | Docker-native service discovery, auto-SSL, config via labels not files |
## Multi-Tenancy Strategy
- Scales to thousands of tenants without catalog bloat
- Single connection pool (no per-tenant connection overhead)
- Prisma Client Extensions support RLS via session variables
- Simpler migrations — one schema to manage
- Cost-effective for the planned growth trajectory
## Installation
# Initialize monorepo
# Frontend (apps/web)
# Backend (apps/api)
# Desktop (apps/desktop)
# Tauri CLI installed via cargo or npm
# Shared (packages/shared)
# Types, DTOs, and constants — no runtime deps
# Dev tools (root)
## Docker Services (docker-compose.yml)
## Version Pinning Strategy
- **Major versions:** Pin to major (e.g., `next@16`, `@nestjs/core@11`)
- **Prisma:** Pin exactly — schema changes require matched versions
- **Tailwind/shadcn:** Follow latest within major — utility additions are non-breaking
- **Keycloak Docker image:** Pin to minor (e.g., `quay.io/keycloak/keycloak:26.6`)
## Sources
- [Next.js 16 Docs](https://nextjs.org/docs/app/guides/upgrading/version-16) — Version 16.2.7+ stable
- [NestJS Documentation](https://docs.nestjs.com/) — Version 11.1.x
- [Prisma ORM 7 Announcement](https://www.prisma.io/blog/announcing-prisma-orm-7-0-0) — Pure TypeScript runtime
- [Tauri 2.0 Stable Release](https://v2.tauri.app/blog/tauri-20/) — Cross-platform desktop
- [Keycloak 26.6 Release](https://www.keycloak.org/2026/04/keycloak-2660-released) — Latest stable
- [Turborepo](https://turborepo.dev/) — Version 2.9.x
- [shadcn/ui CLI v4](https://ui.shadcn.com/docs/changelog/2026-03-cli-v4) — March 2026 update
- [Tailwind CSS v4.3](https://tailwindcss.com/blog/tailwindcss-v4-3) — Latest features
- [next-intl](https://next-intl.dev/) — Version 4.13.x
- [react-grid-layout](https://github.com/react-grid-layout/react-grid-layout) — Version 2.2.x TypeScript rewrite
- [PostgreSQL RLS Multi-Tenancy](https://aws.amazon.com/blogs/database/multi-tenant-data-isolation-with-postgresql-row-level-security/)
- [pnpm Workspaces](https://pnpm.io/workspaces) — Workspace management
<!-- GSD:stack-end -->
<!-- GSD:conventions-start source:CONVENTIONS.md -->
## Conventions
Conventions not yet established. Will populate as patterns emerge during development.
<!-- GSD:conventions-end -->
<!-- GSD:architecture-start source:ARCHITECTURE.md -->
## Architecture
Architecture not yet mapped. Follow existing patterns found in the codebase.
<!-- GSD:architecture-end -->
<!-- GSD:skills-start source:skills/ -->
## Project Skills
No project skills found. Add skills to any of: `.claude/skills/`, `.agents/skills/`, `.cursor/skills/`, `.github/skills/`, or `.codex/skills/` with a `SKILL.md` index file.
<!-- GSD:skills-end -->
<!-- GSD:workflow-start source:GSD defaults -->
## GSD Workflow Enforcement
Before using Edit, Write, or other file-changing tools, start work through a GSD command so planning artifacts and execution context stay in sync.
Use these entry points:
- `/gsd-quick` for small fixes, doc updates, and ad-hoc tasks
- `/gsd-debug` for investigation and bug fixing
- `/gsd-execute-phase` for planned phase work
Do not make direct repo edits outside a GSD workflow unless the user explicitly asks to bypass it.
<!-- GSD:workflow-end -->
<!-- GSD:profile-start -->
## Developer Profile
> Profile not yet configured. Run `/gsd-profile-user` to generate your developer profile.
> This section is managed by `generate-claude-profile` -- do not edit manually.
<!-- GSD:profile-end -->