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/database.py

@@ -17,7 +17,7 @@ class Settings(BaseSettings):
     POSTGRES_USER: str = ""
     POSTGRES_PASSWORD: str = ""
     POSTGRES_DB: str = ""
-    
+
     class Config:
         env_file = ".env"
 
@@ -33,10 +33,10 @@ if not settings.POSTGRES_USER or not settings.POSTGRES_PASSWORD or not settings.
 
 class Database:
     """Async database connection pool manager"""
-    
+
     def __init__(self):
         self.pool: Optional[asyncpg.Pool] = None
-    
+
     async def connect(self):
         """Initialize database connection pool"""
         if self.pool is None:
@@ -48,29 +48,29 @@ class Database:
                 command_timeout=60
             )
             logger.info("Database connection pool created successfully")
-    
+
     async def disconnect(self):
         """Close database connection pool"""
         if self.pool:
             await self.pool.close()
             self.pool = None
             logger.info("Database connection pool closed")
-    
+
     @asynccontextmanager
     async def get_connection(self):
         """Get a connection from the pool"""
         if self.pool is None:
             await self.connect()
-        
+        assert self.pool is not None
         async with self.pool.acquire() as connection:
             yield connection
-    
+
     @asynccontextmanager
     async def get_transaction(self):
         """Get a transaction context"""
         if self.pool is None:
             await self.connect()
-        
+        assert self.pool is not None
         async with self.pool.acquire() as connection:
             async with connection.transaction():
                 yield connection