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/config.py

@@ -0,0 +1,18 @@
+import os
+from pathlib import Path
+
+STATE_PATH = Path(os.environ.get("STATE_PATH", "/data/monitor_state.json"))
+CPS_LOG_PATH = Path(os.environ.get("CPS_LOG_PATH", "/data/cps_log.jsonl"))
+BACKGROUND_PATH = Path(os.environ.get("BACKGROUND_PATH", "/data/background_24h.npy"))
+BACKGROUND_SNAPSHOT_PATH = Path(os.environ.get("BACKGROUND_SNAPSHOT_PATH", "/data/background_snapshot.json"))
+LOG_DIR = Path(os.environ.get("LOG_DIR", "/logs"))
+ISOTOPE_INDEX_PATH = Path(os.environ.get("ISOTOPE_INDEX_PATH", "/models/vega_isotope_index.txt"))
+
+ENERGY_OFFSET = float(os.environ.get("ENERGY_CALIBRATION_OFFSET", "0.33"))
+ENERGY_SLOPE = float(os.environ.get("ENERGY_CALIBRATION_SLOPE", "2.97"))
+NUM_CHANNELS = 1024
+
+
+def energy_axis():
+    """Generate energy axis in keV from channel numbers."""
+    return [round(ENERGY_OFFSET + ENERGY_SLOPE * i, 2) for i in range(NUM_CHANNELS)]