feat: dashboard real-time con aggiornamento incrementale

- Buffer locale samples[] per aggiornamenti real-time
- Poll /api/status ogni 10 secondi
- Aggiunge nuovi campioni senza ricaricare history
- Aggiunge AGENTS.md per istruzioni agenti OpenCode
- Aggiunge team agenti in .opencode/agents/

AGENTS.md

@@ -0,0 +1,41 @@
+# AGENTS.md
+
+## Quick Commands
+```bash
+pytest -q                    # Run all tests
+python app.py                # Start server (requires valid .env)
+```
+
+## Testing
+- Tests use `config_override` in `create_app()` to mock settings and skip the collector thread (`start_collector=False`).
+- No database connection required for tests—SQLite uses temp directories.
+- Test files: `tests/test_api.py` with 3 test functions.
+
+## Required Env Vars
+| Variable | Purpose |
+|----------|---------|
+| `SUPABASE_DB_HOST` | Connection pooler hostname |
+| `SUPABASE_DB_PORT` | Pooler port (typically 6543) |
+| `SUPABASE_DB_NAME` | Database name |
+| `SUPABASE_DB_USER` | User in format `postgres.<project-ref>` |
+| `SUPABASE_DB_PASSWORD` | Password |
+
+## App Architecture
+- **Entry**: `app.py` exports `create_app()` and `app` (FastAPI instance).
+- **Config**: `load_config()` validates required vars, returns `Settings` dataclass.
+- **Storage**: `RRDStore` class manages SQLite circular buffer (auto-prunes based on `max_samples`).
+- **Ping**: `run_ping()` executes keep-alive query, returns `(success, latency_ms, error_message)`.
+- **Collector**: `collector_loop()` runs in daemon thread, interval from `PING_INTERVAL_MINUTES`.
+
+## API Endpoints
+- `GET /` — Dashboard (SmokePing-style)
+- `GET /api/status` — Latest sample
+- `GET /api/history?hours=48` — Sample history (max 48h)
+- `GET /docs` — Swagger UI
+- `GET /openapi.json` — OpenAPI schema
+
+## Docker
+```bash
+docker build -t supabase-pinger .
+docker run -d --env-file .env -p 8080:8080 --restart unless-stopped supabase-pinger
+```