Forecasting app: hybrid port to HNF stack

Python FastAPI ML backend kept intact; auth replaced with central hnf_session cookie verification. Frontend rebuilt on React 18 + TS + Vite with stack design system, Plotly charts retained. Shared Postgres via DATABASE_URL; schema applied on startup.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/nginx.conf

@@ -0,0 +1,35 @@
+server {
+  listen 80;
+  server_name _;
+
+  # 1. Central auth proxy
+  location /forecasting/api/auth/ {
+    proxy_pass http://10.10.10.101:3001/api/auth/;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+  }
+
+  # 2. App backend (Python FastAPI on port 8000)
+  location /forecasting/api/ {
+    proxy_pass http://backend:8000/;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header Cookie $http_cookie;
+    proxy_read_timeout 300s;
+    proxy_connect_timeout 30s;
+    client_max_body_size 50M;
+  }
+
+  # 3. Health
+  location /forecasting/health {
+    proxy_pass http://backend:8000/health;
+  }
+
+  # 4. SPA fallback
+  location /forecasting/ {
+    root /usr/share/nginx/html;
+    try_files $uri $uri/ /forecasting/index.html;
+  }
+}