fix(deploy): embed prisma migrate deploy in API startup

- Move prisma to runtime dependencies so it's available in prod image
- API runs migrate deploy before starting (handles fresh installs + updates)
- Remove separate migrate service from prod compose

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.prod.yml

@@ -1,16 +1,4 @@
 services:
-  migrate:
-    image: git.vicolab.de/schalli/tessera-ctl/api:latest
-    command: sh -c "cd /app && node_modules/.bin/prisma migrate deploy --schema apps/api/prisma/schema.prisma"
-    environment:
-      DATABASE_URL: ${DATABASE_URL}
-    networks:
-      - data-net
-    depends_on:
-      db:
-        condition: service_healthy
-    restart: "no"
-
   web:
     image: git.vicolab.de/schalli/tessera-ctl/web:latest
     restart: unless-stopped
@@ -39,8 +27,6 @@ services:
     depends_on:
       db:
         condition: service_healthy
-      migrate:
-        condition: service_completed_successfully
     environment:
       DATABASE_URL: ${DATABASE_URL}
       JWT_SECRET: ${JWT_SECRET}