Complete Docker compose deployment setup

- Add an API container entrypoint that waits for PostgreSQL, runs Prisma migrations, seeds demo data, and then starts NestJS.

- Keep Prisma CLI and seed dependencies available in the API runtime image and copy seed source dependencies into the container.

- Add Docker Compose healthchecks and health-based startup ordering for PostgreSQL, API, and Nginx web services.

- Add Docker initialization environment switches for migrations, seed, and startup retries.

- Add a dedicated Docker deployment guide covering services, ports, initialization, HTTPS, production variables, backup, restore, and troubleshooting.

- Update README, AGENTS, installation, deployment, progress, and environment example docs for the Dockerized workflow.

package.json

@@ -15,6 +15,7 @@
     "test": "vitest run",
     "test:e2e": "playwright test",
     "prisma:generate": "prisma generate --schema server/prisma/schema.prisma",
+    "prisma:deploy": "prisma migrate deploy --schema server/prisma/schema.prisma",
     "prisma:migrate": "prisma migrate dev --schema server/prisma/schema.prisma",
     "prisma:seed": "prisma db seed --schema server/prisma/schema.prisma"
   },