fix: route people.* to frontend; path-route API/admin/oauth2 to backend

people.* now routes / to people-frontend (nginx/React SPA).
Path prefixes /api/, /admin/, and /o/ are forwarded to people-backend
(Django/gunicorn), matching the app's URL structure.

Previously all people.* traffic hit people-backend directly, causing
Django to return 404 "Page not found at /" for the root path.

The [[routes.paths]] mechanism already existed in the proxy (used by
the auth route) — only a config update was needed.

base/ingress/pingora-config.yaml

@@ -62,7 +62,20 @@ data:
 
     [[routes]]
     host_prefix = "people"
-    backend     = "http://people-backend.lasuite.svc.cluster.local:80"
+    backend     = "http://people-frontend.lasuite.svc.cluster.local:80"
+
+      # Backend handles the API, Django admin, and OAuth2 provider.
+      [[routes.paths]]
+      prefix  = "/api/"
+      backend = "http://people-backend.lasuite.svc.cluster.local:80"
+
+      [[routes.paths]]
+      prefix  = "/admin/"
+      backend = "http://people-backend.lasuite.svc.cluster.local:80"
+
+      [[routes.paths]]
+      prefix  = "/o/"
+      backend = "http://people-backend.lasuite.svc.cluster.local:80"
 
     [[routes]]
     host_prefix = "find"