chore: bring flutter client, docs, deploy and tools into monorepo

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+---
+name: flutter-expert
+description: Use when building cross-platform applications with Flutter 3+ and Dart. Invoke for widget development, Riverpod/Bloc state management, GoRouter navigation, platform-specific implementations, performance optimization.
+license: MIT
+metadata:
+  author: https://github.com/Jeffallan
+  version: "1.1.0"
+  domain: frontend
+  triggers: Flutter, Dart, widget, Riverpod, Bloc, GoRouter, cross-platform
+  role: specialist
+  scope: implementation
+  output-format: code
+  related-skills: react-native-expert, test-master, fullstack-guardian
+---
+
+# Flutter Expert
+
+Senior mobile engineer building high-performance cross-platform applications with Flutter 3 and Dart.
+
+## When to Use This Skill
+
+- Building cross-platform Flutter applications
+- Implementing state management (Riverpod, Bloc)
+- Setting up navigation with GoRouter
+- Creating custom widgets and animations
+- Optimizing Flutter performance
+- Platform-specific implementations
+
+## Core Workflow
+
+1. **Setup** — Scaffold project, add dependencies (`flutter pub get`), configure routing
+2. **State** — Define Riverpod providers or Bloc/Cubit classes; verify with `flutter analyze`
+   - If `flutter analyze` reports issues: fix all lints and warnings before proceeding; re-run until clean
+3. **Widgets** — Build reusable, const-optimized components; run `flutter test` after each feature
+   - If tests fail: inspect widget tree with Flutter DevTools, fix failing assertions, re-run `flutter test`
+4. **Test** — Write widget and integration tests; confirm with `flutter test --coverage`
+   - If coverage drops or tests fail: identify untested branches, add targeted tests, re-run before merging
+5. **Optimize** — Profile with Flutter DevTools (`flutter run --profile`), eliminate jank, reduce rebuilds
+   - If jank persists: check rebuild counts in the Performance overlay, isolate expensive `build()` calls, apply `const` or move state closer to consumers
+
+## Reference Guide
+
+Load detailed guidance based on context:
+
+| Topic | Reference | Load When |
+|-------|-----------|-----------|
+| Riverpod | `references/riverpod-state.md` | State management, providers, notifiers |
+| Bloc | `references/bloc-state.md` | Bloc, Cubit, event-driven state, complex business logic |
+| GoRouter | `references/gorouter-navigation.md` | Navigation, routing, deep linking |
+| Widgets | `references/widget-patterns.md` | Building UI components, const optimization |
+| Structure | `references/project-structure.md` | Setting up project, architecture |
+| Performance | `references/performance.md` | Optimization, profiling, jank fixes |
+
+## Code Examples
+
+### Riverpod Provider + ConsumerWidget (correct pattern)
+
+```dart
+// provider definition
+final counterProvider = StateNotifierProvider<CounterNotifier, int>(
+  (ref) => CounterNotifier(),
+);
+
+class CounterNotifier extends StateNotifier<int> {
+  CounterNotifier() : super(0);
+  void increment() => state = state + 1; // new instance, never mutate
+}
+
+// consuming widget — use ConsumerWidget, not StatefulWidget
+class CounterView extends ConsumerWidget {
+  const CounterView({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final count = ref.watch(counterProvider);
+    return Text('$count');
+  }
+}
+```
+
+### Before / After — State Management
+
+```dart
+// ❌ WRONG: app-wide state in setState
+class _BadCounterState extends State<BadCounter> {
+  int _count = 0;
+  void _inc() => setState(() => _count++); // causes full subtree rebuild
+}
+
+// ✅ CORRECT: scoped Riverpod consumer
+class GoodCounter extends ConsumerWidget {
+  const GoodCounter({super.key});
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final count = ref.watch(counterProvider);
+    return IconButton(
+      onPressed: () => ref.read(counterProvider.notifier).increment(),
+      icon: const Icon(Icons.add), // const on static widgets
+    );
+  }
+}
+```
+
+## Constraints
+
+### MUST DO
+- Use `const` constructors wherever possible
+- Implement proper keys for lists
+- Use `Consumer`/`ConsumerWidget` for state (not `StatefulWidget`)
+- Follow Material/Cupertino design guidelines
+- Profile with DevTools, fix jank
+- Test widgets with `flutter_test`
+
+### MUST NOT DO
+- Build widgets inside `build()` method
+- Mutate state directly (always create new instances)
+- Use `setState` for app-wide state
+- Skip `const` on static widgets
+- Ignore platform-specific behavior
+- Block UI thread with heavy computation (use `compute()`)
+
+## Troubleshooting Common Failures
+
+| Symptom | Likely Cause | Recovery |
+|---------|-------------|----------|
+| `flutter analyze` errors | Unresolved imports, missing `const`, type mismatches | Fix flagged lines; run `flutter pub get` if imports are missing |
+| Widget test assertion failures | Widget tree mismatch or async state not settled | Use `tester.pumpAndSettle()` after state changes; verify finder selectors |
+| Build fails after adding package | Incompatible dependency version | Run `flutter pub upgrade --major-versions`; check pub.dev compatibility |
+| Jank / dropped frames | Expensive `build()` calls, uncached widgets, heavy main-thread work | Use `RepaintBoundary`, move heavy work to `compute()`, add `const` |
+| Hot reload not reflecting changes | State held in `StateNotifier` not reset | Use hot restart (`R` in terminal) to reset full app state |
+
+## Output Templates
+
+When implementing Flutter features, provide:
+1. Widget code with proper `const` usage
+2. Provider/Bloc definitions
+3. Route configuration if needed
+4. Test file structure
+
+[Documentation](https://jeffallan.github.io/claude-skills/skills/frontend/flutter-expert/)