Add CP→CA→PI platform foundation on MapMil monorepo.

Unify parsing workers, analytics API with PostgreSQL, map UI, and PI distribution into centers/ with Docker Compose.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/nginx.conf

@@ -0,0 +1,19 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /api/ {
+        client_max_body_size 50M;
+        proxy_pass http://backend:8000/api/;
+        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 X-Forwarded-Proto $scheme;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}