Add full app source

Adds the Flutter inventory app source, cleaned up for a shared repo:
generic package name, no hardcoded ERP endpoints (moved to gitignored
local config), no dead auth code, no debug logging of session data.

lib/controllers/user_controller.dart

@@ -0,0 +1,25 @@
+import 'package:get/get.dart';
+import 'package:inventory_app/service/axelor_client.dart';
+
+class UserController extends GetxController {
+  var isLoading = false.obs;
+  var user = Rx<Map<String, dynamic>?>(null);
+
+  Future<void> loadUser() async {
+    try {
+      isLoading.value = true;
+      final client = await AxelorClient.create();
+      final profile = await client.fetchUserProfile();
+      user.value = profile;
+    } catch (e) {
+      print("❌ Failed to load user: $e");
+    } finally {
+      isLoading.value = false;
+    }
+  }
+
+  // Optional: clear user when logging out
+  void clearUser() {
+    user.value = null;
+  }
+}