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/utils/geo.py

@@ -9,7 +9,7 @@ def point_in_polygon(lat: float, lon: float, polygon_coords: list) -> bool:
         return False
 
     # MultiPolygon: check each polygon
-    if isinstance(polygon_coords[0], list) and isinstance(polygon_coords[0][0], list):
+    if isinstance(polygon_coords[0], list) and polygon_coords[0] and isinstance(polygon_coords[0][0], list):
         for polygon in polygon_coords:
             if polygon and isinstance(polygon[0], list):
                 ring = polygon[0] if isinstance(polygon[0][0], list) else polygon
@@ -25,6 +25,8 @@ def point_in_polygon(lat: float, lon: float, polygon_coords: list) -> bool:
 def point_in_ring(lat: float, lon: float, ring: list) -> bool:
     """Ray casting algorithm for point-in-ring test."""
     n = len(ring)
+    if n < 3:
+        return False
     inside = False
 
     x, y = lon, lat