feat: Initial CBPOA commit — 武汉儿童呼吸疾病风险评估系统

Context: Build a spatial risk assessment system correlating air quality
data with children's respiratory disease incidence across Wuhan.

Approach: FastAPI backend serving PostGIS spatial queries, React
frontend with Deck.gl maps, and a PyTorch SpatialTemporalGCN pipeline
for multi-day (1d/3d/7d) risk prediction.

Changes:
- backend/ — FastAPI API with auth (JWT), alerts, risk analysis,
  geocoded case data, grid statistics, and report endpoints
- frontend/ — React dashboard with interactive risk maps, alert
  monitoring, district comparison charts, and timeline player
- models/ — SpatialTemporalGCN model with trained weights and ONNX
  export for inference
- scripts/ — ETL pipeline for weather + medical data, grid generation,
  feature engineering, training, and daily inference
- deploy/ — Docker Compose configs for backend, frontend, and MLflow
- docs/ — API docs, deployment guide, user guide, and code review

Impact: Enables spatial risk visualization, alert monitoring, and
ML-driven health risk forecasting for environmental health teams.

frontend/CLAUDE.md

@@ -0,0 +1,49 @@
+# Frontend — React + TypeScript + Leaflet
+
+## Stack
+
+- React 18, TypeScript 5, Vite 5
+- Tailwind CSS, Recharts, Zustand (state), Axios
+- Leaflet / react-leaflet (maps)
+- Playwright (e2e tests)
+
+## Structure
+
+```
+frontend/src/
+  main.tsx              # Entry point
+  App.tsx               # Router setup
+  components/           # Reusable UI (maps, charts, nav)
+  pages/                # Route-level views
+  services/api.ts       # Axios client with TTL cache + request dedup
+  stores/               # Zustand stores
+  types/index.ts        # Shared TypeScript interfaces
+  utils/                # Helpers (responsive.ts)
+```
+
+## Path Alias
+
+`@/` maps to `src/` — use `import { X } from '@/components/X'`.
+
+## Patterns
+
+- Components: PascalCase, one per file, default export
+- API calls: use `services/api.ts` wrappers (`riskApi`, `alertApi`, `caseApi`, `gridApi`) — they handle caching and request dedup
+- State: Zustand stores in `stores/`, typed with TypeScript interfaces from `types/`
+- Styling: Tailwind utility classes, no CSS modules
+
+## Running
+
+```bash
+cd frontend
+pnpm dev          # localhost:5173, proxies /api → localhost:8000
+pnpm build        # tsc + vite build → dist/
+```
+
+## Anti-Patterns
+
+- Don't call axios directly — use the cached API wrappers in `services/api.ts`
+- Don't use `any` in TypeScript types — use `unknown` and narrow
+- Don't mix data fetching with presentation — fetch in pages, render in components
+- Don't inline styles when Tailwind classes work
+- Don't create god components (>200 lines) — extract sub-components