docs: consolidate and update project documentation

- Fix port numbers across all docs (API :3001, Web :3000)
- Add 6 missing modules to README, CLAUDE.md, and architecture doc
  (agents, health, inquiries, leads, reviews, metrics/web-vitals)
- Add Swagger UI reference and /api/v1 prefix notes
- Create docs/api-endpoints.md with complete REST API reference
- Create docs/README.md as documentation index
- Update deployment guide with Loki, Promtail, pg-backup services
- Update health check table with all current endpoints

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docs/dev-environment.md

@@ -34,7 +34,9 @@ pnpm db:seed
 pnpm dev
 ```
 
-API runs at `http://localhost:3000`, Web at `http://localhost:3001`.
+API runs at `http://localhost:3001/api/v1`, Web at `http://localhost:3000`.
+
+> **Swagger UI**: `http://localhost:3001/api/v1/docs` — interactive API documentation.
 
 ## Infrastructure Services