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/tool/refresh_goldens.dart

@@ -0,0 +1,47 @@
+// Regenerates test/golden/* after intentional template changes.
+// Run from generator/: dart run tool/refresh_goldens.dart
+
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+
+import '../src/models.dart';
+import '../src/renderer.dart';
+import '../src/resolver.dart';
+import '../test/golden_briefs.dart';
+
+Future<void> main() async {
+  final templateSrc = _templateDir();
+  if (!Directory(templateSrc).existsSync()) {
+    stderr.writeln('Template dir not found: $templateSrc');
+    exitCode = 1;
+    return;
+  }
+
+  final cases = <String, ProjectBrief>{
+    'bloc-clean-firebase': kBlocCleanFirebaseBrief,
+    'riverpod-ff-supabase': kRiverpodFfSupabaseBrief,
+    'getx-mvc-rest': kGetxMvcRestBrief,
+  };
+
+  for (final e in cases.entries) {
+    final profile = e.key;
+    final brief = e.value;
+    final rendered = await Renderer.render(
+      brief: brief,
+      templateFiles: Resolver.resolve(brief),
+      templateSrc: templateSrc,
+    );
+    for (final out in rendered.entries) {
+      final file = File('test/golden/$profile/${out.key}');
+      await file.parent.create(recursive: true);
+      await file.writeAsString(out.value);
+      stdout.writeln('Wrote ${file.path}');
+    }
+  }
+}
+
+String _templateDir() {
+  final scriptDir = File(Platform.script.toFilePath()).parent;
+  return p.normalize(p.join(scriptDir.path, '..', '..', 'templates'));
+}