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/

.opencode/skills/supabase-pinger-dev/SKILL.md

@@ -0,0 +1,74 @@
+---
+name: supabase-pinger-dev
+description: "Supabase Pinger — manage Supabase keep-alive service"
+allowed-tools:
+  - Read
+  - Write
+  - Edit
+  - Bash
+  - Glob
+  - Grep
+---
+
+<objective>
+Development skill for supabase-pinger project. Provides project-specific commands and context.
+</objective>
+
+<project_structure>
+supabase-pinger/
+├── app.py              # FastAPI app + ping logic
+├── tests/
+│   ├── conftest.py    # Test config
+│   └── test_api.py    # API tests
+├── AGENTS.md           # Agent instructions
+├── requirements.txt    # Python deps
+├── Dockerfile
+└── docker-compose.yml
+</project_structure>
+
+<commands>
+# Run server (requires valid .env)
+python app.py
+
+# Run tests
+pytest -q
+
+# Docker build
+docker build -t supabase-pinger .
+
+# Docker run
+docker run -d --env-file .env -p 8080:8080 --restart unless-stopped supabase-pinger
+</commands>
+
+<api_endpoints>
+- GET /              # Dashboard (SmokePing-style)
+- GET /api/status   # Latest sample
+- GET /api/history  # History (hours param)
+- GET /docs         # Swagger UI
+- GET /openapi.json # OpenAPI schema
+</api_endpoints>
+
+<key_components>
+- create_app()    # Main factory
+- Settings       # Config dataclass
+- RRDStore      # Circular buffer storage
+- run_ping()    # Execute keep-alive
+- collector_loop() # Daemon thread
+</key_components>
+
+<env_vars>
+- SUPABASE_DB_HOST
+- SUPABASE_DB_PORT
+- SUPABASE_DB_NAME
+- SUPABASE_DB_USER
+- SUPABASE_DB_PASSWORD
+- PING_INTERVAL_MINUTES
+- PING_QUERY
+- WEB_HOST
+- WEB_PORT
+</env_vars>
+
+<when_to_use>
+- Any work on supabase-pinger project
+- Development, testing, or deployment
+</when_to_use>