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>

web/health.json

@@ -1,8 +0,0 @@
-{
-  "status": "healthy",
-  "name": "tatlock_ui",
-  "title": "Tatlock - a Home Lab AI",
-  "version": "1.0.4",
-  "buildNumber": 1,
-  "fullVersion": "1.0.4+1"
-}