feat(flutter-cursor-templates): introduce MCP integration and conventions in project brief

- Added optional MCP integration settings in project-brief.yaml, allowing for environment-based server configurations.
- Introduced conventions for strict package imports to enhance code organization and maintainability.
- Updated brief schema to validate new MCP properties and ensure correct usage.
- Implemented MCP JSON builder to generate .cursor/mcp.json based on project brief settings.
- Enhanced resolver to include MCP configuration in generated files when enabled.

This update improves integration capabilities and enforces coding standards across the project.

flutter-cursor-templates/generator/test/golden_briefs.dart

@@ -0,0 +1,91 @@
+// Shared ProjectBrief fixtures for golden tests and tool/refresh_goldens.dart
+
+import '../src/models.dart';
+
+final kBlocCleanFirebaseBrief = ProjectBrief(
+  projectName: 'TestApp',
+  packageId: 'com.test.testapp',
+  description: 'Test app for golden tests',
+  scale: 'medium',
+  stateManagement: 'bloc',
+  routing: 'gorouter',
+  architecture: 'clean',
+  backends: ['firebase'],
+  auth: 'firebase_auth',
+  platforms: ['ios', 'android'],
+  codegenTools: ['freezed'],
+  flavors: ['dev', 'prod'],
+  cicd: 'github_actions',
+  testingDepth: 'unit_widget',
+  e2eTool: 'patrol',
+  designSource: 'none',
+  figmaUrl: '',
+  apiDocsFormat: 'none',
+  apiDocsPath: '',
+  referenceRepos: [],
+  localPaths: [],
+  featureModules: ['auth', 'home', 'products'],
+  specialFeatures: [],
+  i18nEnabled: false,
+  locales: ['en'],
+  strictPackageImports: true,
+);
+
+final kRiverpodFfSupabaseBrief = ProjectBrief(
+  projectName: 'TaskFlow',
+  packageId: 'com.test.taskflow',
+  description: 'Task management app',
+  scale: 'small',
+  stateManagement: 'riverpod',
+  routing: 'gorouter',
+  architecture: 'feature_first',
+  backends: ['supabase'],
+  auth: 'supabase_auth',
+  platforms: ['ios', 'android', 'web'],
+  codegenTools: ['freezed', 'json_serializable'],
+  flavors: ['dev', 'prod'],
+  cicd: 'github_actions',
+  testingDepth: 'unit_widget',
+  e2eTool: 'patrol',
+  designSource: 'none',
+  figmaUrl: '',
+  apiDocsFormat: 'none',
+  apiDocsPath: '',
+  referenceRepos: [],
+  localPaths: [],
+  featureModules: ['auth', 'tasks', 'profile'],
+  specialFeatures: [],
+  i18nEnabled: true,
+  locales: ['en', 'fr'],
+  themeVariants: const ['light', 'dark', 'high_contrast'],
+);
+
+final kGetxMvcRestBrief = ProjectBrief(
+  projectName: 'LegacyApp',
+  packageId: 'com.test.legacy',
+  description: 'Legacy GetX app',
+  scale: 'medium',
+  stateManagement: 'getx',
+  routing: 'getx_nav',
+  architecture: 'mvc',
+  backends: ['rest'],
+  auth: 'jwt_rest',
+  platforms: ['ios', 'android'],
+  codegenTools: [],
+  flavors: ['dev', 'prod'],
+  cicd: 'codemagic',
+  testingDepth: 'unit_widget',
+  e2eTool: 'patrol',
+  designSource: 'none',
+  figmaUrl: '',
+  apiDocsFormat: 'openapi',
+  apiDocsPath: 'docs/api.yaml',
+  referenceRepos: [],
+  localPaths: [],
+  featureModules: ['auth', 'dashboard'],
+  specialFeatures: [],
+  i18nEnabled: false,
+  locales: ['en'],
+  mcpConfigEnabled: true,
+  mcpPreset: 'auto',
+);