feat(backend): add standalone data plane

Replace the Supabase application data plane with the Node/PostgreSQL API, migrate mobile, admin, web, and MCP callers, add controlled cutover tooling, and define hardened Dokploy infrastructure.

apps/admin/src/config.ts

@@ -1,11 +1,19 @@
 import { createClient } from '@supabase/supabase-js';
 
-export const supabaseConfig = {
+export const supabaseConfig = {
     url: import.meta.env.VITE_SUPABASE_URL,
     anonKey: import.meta.env.VITE_SUPABASE_ANON_KEY,
-};
-
-export const supabase = createClient(
-    supabaseConfig.url,
-    supabaseConfig.anonKey
-);
+};
+
+export const authClient = createClient(
+    supabaseConfig.url,
+    supabaseConfig.anonKey
+);
+
+const configuredApiUrl = import.meta.env.VITE_API_URL;
+
+if (!configuredApiUrl) {
+    throw new Error('Missing required environment variable: VITE_API_URL');
+}
+
+export const apiUrl = configuredApiUrl.replace(/\/$/, '');