feat: add analysis pages and raster risk map

Ship a new app version with broader analytics, restructured
dashboards, and a server-rendered risk map.

Frontend:
- Add Overview, Demographic, Disease, and Environmental Health
  analysis pages
- Add AnomalyMarkers, CalendarHeatmap, and MetricHeatmapTable
  components
- Rebuild Alerts map onto server-rendered raster risk tiles;
  expand Monitoring, Trend, and District Comparison views
- Extend API client, stores, and TypeScript types

Backend:
- Add environment router (pollutants, lag correlations)
- Add risk_raster util serving XYZ 100m risk tiles
- Expand cases endpoints (demographics, seasonality, diagnoses)
  and insights; harden auth and file-based loaders

Data & tooling:
- Add processed outpatient/inpatient/combined case parquet (LFS)
- Add nested CLAUDE.md guides, pyrightconfig, and test updates

backend/tests/test_error_handling.py

@@ -37,8 +37,11 @@ class TestMissingResources:
 
 class TestInvalidForecastDay:
     def test_forecast_out_of_range(self, client: TestClient):
+        # days=0 violates the ge=1 bound on /forecast/{days}, so FastAPI returns 422.
+        # (This previously returned 200 because `Path` was shadowed by `pathlib.Path`,
+        # silently disabling validation — fixed by the risk.py import correction.)
         resp = client.get("/api/risk/forecast/0")
-        assert resp.status_code in (200, 404)
+        assert resp.status_code == 422
 
     def test_forecast_too_large(self, client: TestClient):
         resp = client.get("/api/risk/forecast/999")