Dashboard web FastAPI + Chart.js

- 4 vues : spectre temps reel, historique detections, background, timeline CPS
- API REST : /api/status, /api/spectrum/current, /api/spectrum/difference,
  /api/background, /api/background/spectrum, /api/history, /api/cps/timeline
- Frontend vanilla JS + Chart.js (pas de Node.js, leger pour Pi 4)
- Moniteur modifie pour exporter son etat dans /data/monitor_state.json
  et le CPS dans /data/cps_log.jsonl chaque cycle
- Nouveau conteneur Docker 'web' sur port 8080
- Theme sombre, calibration energie (E = 0.33 + 2.97 * canal)

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

web/app/main.py

@@ -0,0 +1,19 @@
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse
+from app.routers import status, spectrum, background, history, cps
+
+app = FastAPI(title="Radiacode 103 Dashboard", version="1.0.0")
+
+app.include_router(status.router, prefix="/api")
+app.include_router(spectrum.router, prefix="/api/spectrum")
+app.include_router(background.router, prefix="/api/background")
+app.include_router(history.router, prefix="/api/history")
+app.include_router(cps.router, prefix="/api/cps")
+
+app.mount("/static", StaticFiles(directory="static"), name="static")
+
+
+@app.get("/")
+async def root():
+    return FileResponse("static/index.html")