feat: initialize Flutter project with version management

- Initialize Flutter 3.38 project with all platforms
- Add build-time version generation from pubspec.yaml
- Print version to console on app startup
- Create CHANGELOG.md following Keep a Changelog format
- Update .gitignore for Flutter + generated files
- Basic app scaffold with Material 3 theming

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/version.g.dart

@@ -0,0 +1,13 @@
+// GENERATED FILE - DO NOT EDIT
+// Generated by: dart run tool/generate_version.dart
+
+/// Application version information from pubspec.yaml
+class AppVersion {
+  AppVersion._();
+
+  static const String name = 'tatlock_ui';
+  static const String description = 'Tatlock - a Home Lab AI';
+  static const String version = '0.1.0';
+  static const int buildNumber = 1;
+  static const String fullVersion = '0.1.0+1';
+}