Integrate Oudelaa backend features, security, tests, and deployment updates

README.md

@@ -1,5 +1,18 @@
 # Oudelaa Backend
 
+Advanced search deployment and compatibility notes are documented in
+[`docs/SEARCH_ARCHITECTURE.md`](docs/SEARCH_ARCHITECTURE.md).
+
+Home feed candidate generation, personalization, safety, diversity, and cursor behavior are
+documented in [`docs/FEED_RANKING.md`](docs/FEED_RANKING.md).
+
 Production-oriented NestJS backend for a social media platform.
 
 Frontend handoff notes and WebSocket event docs live in [docs/FRONTEND_INTEGRATION.md](docs/FRONTEND_INTEGRATION.md).
+
+Capacity baselines and production limitations are tracked in
+[`docs/SYSTEM_STRENGTH_REPORT.md`](docs/SYSTEM_STRENGTH_REPORT.md), with repeatable CI performance
+gates documented in [`PERFORMANCE_TESTING.md`](PERFORMANCE_TESTING.md).
+
+For S3 deployments, authenticated clients can request a short-lived, user-scoped direct upload
+with `POST /api/v1/media/uploads/presign`. Existing multipart endpoints remain supported.