feat: add Flutter schema-driven form cards

mobile/test/core/forms/dynamic_form_card_test.dart

@@ -0,0 +1,30 @@
+import 'package:aioa_mobile/core/forms/presentation/dynamic_form_card.dart';
+import 'package:aioa_mobile/core/forms/schema/form_schema.dart';
+import 'package:aioa_mobile/features/form/domain/leave_form_definition.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('renders controls from data and UI schema', (tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          body: SingleChildScrollView(
+            child: DynamicFormCard(
+              definition: leaveFormDefinition,
+              state: const DynamicFormState(),
+              onChanged: (_, _) {},
+            ),
+          ),
+        ),
+      ),
+    );
+
+    expect(find.text('请假信息'), findsOneWidget);
+    expect(find.text('补充说明'), findsOneWidget);
+    expect(find.text('请假类型 *'), findsOneWidget);
+    expect(find.text('开始时间 *'), findsOneWidget);
+    expect(find.text('结束时间 *'), findsOneWidget);
+    expect(find.text('请假原因 *'), findsOneWidget);
+  });
+}

mobile/test/core/forms/form_validator_test.dart

@@ -0,0 +1,25 @@
+import 'package:aioa_mobile/core/forms/schema/form_validator.dart';
+import 'package:aioa_mobile/features/form/domain/leave_form_definition.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  test('required fields are validated from JSON Schema', () {
+    final errors = validateDynamicForm(
+      leaveFormDefinition.dataSchema,
+      const {},
+    );
+
+    expect(errors.keys, containsAll(['type', 'startsAt', 'endsAt', 'reason']));
+  });
+
+  test('valid leave draft passes schema validation', () {
+    final errors = validateDynamicForm(leaveFormDefinition.dataSchema, {
+      'type': 'PERSONAL',
+      'startsAt': '2026-07-20T01:00:00Z',
+      'endsAt': '2026-07-20T05:00:00Z',
+      'reason': '办理个人事务',
+    });
+
+    expect(errors, isEmpty);
+  });
+}