feat(02-01): Prisma schema expansion, RLS migration, and PrismaModule

- Add User, Role enum, PasswordResetToken, LdapConfig, LdapFieldMapping models
- Expand Tenant model with isActive, users relation, ldapConfig relation
- Create RLS migration with tenant isolation policies on all tenant-scoped tables
- Create PrismaModule (global), PrismaService, and forTenant extension
- Add JWT_SECRET, TESSERA_ADMIN_*, TESSERA_FORCE_CHANGE env vars to docker-compose
- Install @nestjs/jwt, @nestjs/passport, passport, argon2, class-validator deps

apps/api/src/prisma/prisma-tenant.extension.ts

@@ -0,0 +1,24 @@
+import { PrismaClient } from '@prisma/client';
+
+/**
+ * Creates a tenant-scoped Prisma client that sets the app.current_tenant
+ * PostgreSQL session variable before every query via RLS.
+ *
+ * Uses parameterized set_config to prevent SQL injection (T-02-05).
+ */
+export function forTenant(prisma: PrismaClient, tenantId: string) {
+  return prisma.$extends({
+    query: {
+      $allOperations({ args, query }) {
+        return (prisma as any).$transaction(async (tx: any) => {
+          // Use parameterized query to avoid SQL injection
+          await tx.$executeRawUnsafe(
+            `SELECT set_config('app.current_tenant', $1, true)`,
+            tenantId,
+          );
+          return query(args);
+        });
+      },
+    },
+  });
+}