refactor(coolify): externalize postgres, qdrant, S3; remove jitsi/synapse

- Remove PostgreSQL, Qdrant, MinIO services (managed separately in Coolify)
- Remove Jitsi stack (web, xmpp, jicofo, jvb) and Synapse/synapse-db
- Add POSTGRES_HOST, QDRANT_URL, S3_ENDPOINT/S3_ACCESS_KEY/S3_SECRET_KEY env vars
- Remove Traefik labels from internal-only services
- Health aggregator no longer checks external services
- Core now has 10 services: valkey + 9 application services

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

.env.coolify.example

@@ -5,7 +5,9 @@
 # for the breakpilot-core Docker Compose resource.
 # =========================================================
 
-# --- Database ---
+# --- External PostgreSQL (Coolify-managed) ---
+POSTGRES_HOST=<coolify-postgres-hostname>
+POSTGRES_PORT=5432
 POSTGRES_USER=breakpilot
 POSTGRES_PASSWORD=CHANGE_ME_STRONG_PASSWORD
 POSTGRES_DB=breakpilot_db
@@ -15,12 +17,17 @@ JWT_SECRET=CHANGE_ME_RANDOM_64_CHARS
 JWT_REFRESH_SECRET=CHANGE_ME_ANOTHER_RANDOM_64_CHARS
 INTERNAL_API_KEY=CHANGE_ME_INTERNAL_KEY
 
-# --- MinIO (S3 Object Storage) ---
-MINIO_ROOT_USER=breakpilot
-MINIO_ROOT_PASSWORD=CHANGE_ME_MINIO_PASSWORD
-MINIO_BUCKET=breakpilot-rag
+# --- External S3 Storage ---
+S3_ENDPOINT=<s3-endpoint-host:port>
+S3_ACCESS_KEY=CHANGE_ME_S3_ACCESS_KEY
+S3_SECRET_KEY=CHANGE_ME_S3_SECRET_KEY
+S3_BUCKET=breakpilot-rag
+S3_SECURE=true
 
-# --- SMTP (Real mail server, not Mailpit) ---
+# --- External Qdrant (Coolify-managed) ---
+QDRANT_URL=http://<coolify-qdrant-hostname>:6333
+
+# --- SMTP (Real mail server) ---
 SMTP_HOST=smtp.example.com
 SMTP_PORT=587
 SMTP_USERNAME=noreply@breakpilot.ai
@@ -52,20 +59,7 @@ OPENAI_API_KEY=
 COHERE_API_KEY=
 LOG_LEVEL=INFO
 
-# --- Ollama (optional, if running on same server) ---
+# --- Ollama (optional) ---
 OLLAMA_BASE_URL=
 OLLAMA_URL=
 OLLAMA_VOICE_MODEL=
-
-# --- Matrix/Synapse ---
-SYNAPSE_DB_PASSWORD=CHANGE_ME_SYNAPSE_DB_PASSWORD
-SYNAPSE_SERVER_NAME=chat.breakpilot.ai
-SYNAPSE_ENABLE_REGISTRATION=false
-SYNAPSE_LOG_LEVEL=WARNING
-
-# --- Jitsi ---
-JICOFO_AUTH_PASSWORD=CHANGE_ME_JICOFO_PASSWORD
-JVB_AUTH_PASSWORD=CHANGE_ME_JVB_PASSWORD
-JITSI_ENABLE_AUTH=false
-JVB_STUN_SERVERS=stun.l.google.com:19302
-TZ=Europe/Berlin