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/main.dart

@@ -0,0 +1,49 @@
+import 'dart:developer' as developer;
+
+import 'package:flutter/material.dart';
+
+import 'version.g.dart';
+
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  developer.log(
+    '${AppVersion.name} v${AppVersion.fullVersion}',
+    name: 'tatlock_ui',
+  );
+
+  runApp(const TatlockApp());
+}
+
+class TatlockApp extends StatelessWidget {
+  const TatlockApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Tatlock UI',
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(seedColor: Colors.indigo),
+        useMaterial3: true,
+      ),
+      home: const HomePage(),
+    );
+  }
+}
+
+class HomePage extends StatelessWidget {
+  const HomePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('Tatlock UI'),
+      ),
+      body: const Center(
+        child: Text('Welcome to Tatlock UI'),
+      ),
+    );
+  }
+}

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';
+}