chore: stop tracking generated files

- Remove version.g.dart and health.json from git
- These are now regenerated during CI/CD build from pubspec.yaml
- Fixes version mismatch issue in deployments

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

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

lib/version.g.dart

@@ -1,13 +0,0 @@
-// GENERATED FILE - DO NOT EDIT
-// Generated by build_runner from pubspec.yaml
-
-/// 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 = '1.0.4';
-  static const int buildNumber = 1;
-  static const String fullVersion = '1.0.4+1';
-}