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

.env.coolify.example

@@ -0,0 +1,65 @@
+# =========================================================
+# BreakPilot Core — Coolify Environment Variables
+# =========================================================
+# Copy these into Coolify's environment variable UI
+# for the breakpilot-core Docker Compose resource.
+# =========================================================
+
+# --- 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
+
+# --- Security ---
+JWT_SECRET=CHANGE_ME_RANDOM_64_CHARS
+JWT_REFRESH_SECRET=CHANGE_ME_ANOTHER_RANDOM_64_CHARS
+INTERNAL_API_KEY=CHANGE_ME_INTERNAL_KEY
+
+# --- 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
+
+# --- External Qdrant (Coolify-managed) ---
+QDRANT_URL=http://<coolify-qdrant-hostname>:6333
+QDRANT_API_KEY=
+
+# --- SMTP (Real mail server) ---
+SMTP_HOST=smtp.example.com
+SMTP_PORT=587
+SMTP_USERNAME=noreply@breakpilot.ai
+SMTP_PASSWORD=CHANGE_ME_SMTP_PASSWORD
+SMTP_FROM_NAME=BreakPilot
+SMTP_FROM_ADDR=noreply@breakpilot.ai
+
+# --- Session ---
+SESSION_TTL_HOURS=24
+
+# --- Frontend URLs (build args) ---
+NEXT_PUBLIC_CORE_API_URL=https://api-core.breakpilot.ai
+FRONTEND_URL=https://www.breakpilot.ai
+
+# --- Stripe (Billing) ---
+STRIPE_SECRET_KEY=
+STRIPE_WEBHOOK_SECRET=
+STRIPE_PUBLISHABLE_KEY=
+BILLING_SUCCESS_URL=https://www.breakpilot.ai/billing/success
+BILLING_CANCEL_URL=https://www.breakpilot.ai/billing/cancel
+TRIAL_PERIOD_DAYS=14
+
+# --- Embedding Service ---
+EMBEDDING_BACKEND=local
+LOCAL_EMBEDDING_MODEL=BAAI/bge-m3
+LOCAL_RERANKER_MODEL=cross-encoder/ms-marco-MiniLM-L-6-v2
+PDF_EXTRACTION_BACKEND=pymupdf
+OPENAI_API_KEY=
+COHERE_API_KEY=
+LOG_LEVEL=INFO
+
+# --- Ollama (optional, for RAG embeddings) ---
+OLLAMA_URL=
+OLLAMA_EMBED_MODEL=bge-m3