fix: migrate deployment from Hetzner to Coolify (#1)

## Summary
- Add Coolify deployment configuration (docker-compose, healthchecks, network setup)
- Replace deploy-hetzner CI job with Coolify webhook deploy
- Externalize postgres, qdrant, S3 for Coolify environment
- Remove services not needed for SDK deployment (voice, jitsi, synapse)

## All changes since branch creation
- Coolify docker-compose with healthchecks for all services
- CI pipeline: deploy-hetzner → deploy-coolify (simple webhook curl)
- QDRANT_API_KEY support in rag-service
- Alpine-compatible Dockerfile fixes

Co-authored-by: Sharang Parnerkar <parnerkarsharang@gmail.com>
Reviewed-on: #1

rag-service/qdrant_client_wrapper.py

@@ -48,7 +48,11 @@ class QdrantClientWrapper:
     @property
     def client(self) -> QdrantClient:
         if self._client is None:
-            self._client = QdrantClient(url=settings.QDRANT_URL, timeout=30)
+            self._client = QdrantClient(
+                url=settings.QDRANT_URL,
+                api_key=settings.QDRANT_API_KEY or None,
+                timeout=30,
+            )
             logger.info("Connected to Qdrant at %s", settings.QDRANT_URL)
         return self._client