flatten app to repo root and update docker deployment for single-stack runtime

hooks/use-auth-guard.ts

@@ -0,0 +1,16 @@
+'use client';
+
+export function useAuthGuard() {
+  return {
+    session: {
+      user: {
+        id: 1,
+        name: 'Local Operator',
+        email: 'operator@local.fiscal',
+        image: null
+      }
+    },
+    isPending: false,
+    isAuthenticated: true
+  };
+}