feat: add 3D interactive dashboard and 2D BigScreen pages

- New /bigscreen-3d route: React Three Fiber 3D campus with buildings,
  PV panels, heat pumps, meters, and sensors — all procedural geometry
- Interactive: hover highlight, click to select, camera fly-in to
  device detail views (PV inverter, heat pump, meter, heat meter, sensor)
- Real-time data: 15s polling for overview, 5s for selected device
- Energy flow particles along PV→Building, Grid→Building, Building→HP paths
- HUD overlay with date/clock, bottom metrics bar, device list panel
- New /bigscreen route: 2D dashboard with energy flow diagram, charts
- New /devices route: device management page
- Vite config: optimizeDeps.force for R3F dep consistency
- Data backfill script for testing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/launch.json

@@ -4,7 +4,7 @@
     {
       "name": "frontend",
       "runtimeExecutable": "npm",
-      "runtimeArgs": ["run", "dev"],
+      "runtimeArgs": ["run", "dev", "--", "--force"],
       "port": 3000,
       "cwd": "frontend"
     },