feat: Add presence heartbeat for Matrix online status

- matrix-gateway: POST /internal/matrix/presence/online endpoint
- usePresenceHeartbeat hook with activity tracking
- Auto away after 5 min inactivity
- Offline on page close/visibility change
- Integrated in MatrixChatRoom component

services/secondme-service/main.py

@@ -0,0 +1,59 @@
+"""
+Second Me Service — Персональний агент користувача
+"""
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+import logging
+import os
+
+import routes
+import repository
+
+# Logging
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+app = FastAPI(
+    title="DAARION Second Me Service",
+    version="1.0.0",
+    description="Персональний цифровий двійник користувача"
+)
+
+# CORS
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include routes
+app.include_router(routes.router)
+
+# Health check
+@app.get("/health")
+async def health():
+    return {"status": "healthy", "service": "secondme-service"}
+
+
+@app.on_event("startup")
+async def startup():
+    """Startup event"""
+    logger.info("🚀 Second Me Service starting...")
+    logger.info(f"SECONDME_AGENT_ID: {os.getenv('SECONDME_AGENT_ID', 'ag_secondme_global')}")
+    logger.info(f"AGENTS_SERVICE_URL: {os.getenv('AGENTS_SERVICE_URL', 'http://agents-service:7002')}")
+
+
+@app.on_event("shutdown")
+async def shutdown():
+    """Shutdown event"""
+    logger.info("🛑 Second Me Service shutting down...")
+    await repository.close_pool()
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=7003)
+