feat: add Coolify deployment configuration

Add docker-compose.coolify.yml (8 services), .env.coolify.example,
and Gitea Action workflow for Coolify API deployment. Removes
core-health-check, paddleocr, transcription-worker, agent-core,
drive, and docs. Adds Traefik labels for *.breakpilot.ai domain
routing with Let's Encrypt SSL.

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

.env.coolify.example

@@ -0,0 +1,72 @@
+# =========================================================
+# BreakPilot Lehrer — Coolify Environment Variables
+# =========================================================
+# Copy these into Coolify's environment variable UI
+# for the breakpilot-lehrer Docker Compose resource.
+# =========================================================
+
+# --- Database (shared with Core) ---
+POSTGRES_USER=breakpilot
+POSTGRES_PASSWORD=CHANGE_ME_SAME_AS_CORE
+POSTGRES_DB=breakpilot_db
+
+# --- Security ---
+JWT_SECRET=CHANGE_ME_SAME_AS_CORE
+
+# --- MinIO (from Core) ---
+MINIO_ROOT_USER=breakpilot
+MINIO_ROOT_PASSWORD=CHANGE_ME_SAME_AS_CORE
+MINIO_BUCKET=breakpilot-rag
+
+# --- Session ---
+SESSION_TTL_HOURS=24
+
+# --- 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
+
+# --- LLM / Ollama (optional) ---
+OLLAMA_BASE_URL=
+OLLAMA_URL=
+OLLAMA_ENABLED=false
+OLLAMA_DEFAULT_MODEL=
+OLLAMA_VISION_MODEL=
+OLLAMA_CORRECTION_MODEL=
+OLLAMA_TIMEOUT=120
+
+# --- Anthropic (optional) ---
+ANTHROPIC_API_KEY=
+
+# --- vast.ai GPU (optional) ---
+VAST_API_KEY=
+VAST_INSTANCE_ID=
+
+# --- Game Settings ---
+GAME_USE_DATABASE=true
+GAME_REQUIRE_AUTH=true
+GAME_REQUIRE_BILLING=true
+GAME_LLM_MODEL=
+
+# --- Frontend URLs (build args) ---
+NEXT_PUBLIC_API_URL=https://api-lehrer.breakpilot.ai
+NEXT_PUBLIC_KLAUSUR_SERVICE_URL=https://klausur.breakpilot.ai
+NEXT_PUBLIC_VOICE_SERVICE_URL=wss://voice.breakpilot.ai
+NEXT_PUBLIC_BILLING_API_URL=https://api-core.breakpilot.ai
+NEXT_PUBLIC_APP_URL=https://app.breakpilot.ai
+NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=
+
+# --- Edu Search ---
+EDU_SEARCH_URL=
+EDU_SEARCH_API_KEY=
+OPENSEARCH_PASSWORD=CHANGE_ME_OPENSEARCH_PASSWORD
+
+# --- Misc ---
+CONTROL_API_KEY=
+ALERTS_AGENT_ENABLED=false
+PADDLEOCR_SERVICE_URL=
+TROCR_SERVICE_URL=
+CAMUNDA_URL=