Refactor: Code cleanup and localStorage consolidation

This commit includes comprehensive codebase cleanup and refactoring:

## Code Cleanup
- Remove dead TypeScript code (types/monitoring.ts - 194 lines duplicate)
- Remove unused Go functions (GetClusterNodes, MigratePassword, GetClusterHealthInfo)
- Clean up commented-out code blocks across multiple files
- Remove unused TypeScript exports (helpTextClass, private tag color helpers)
- Delete obsolete test files and components

## localStorage Consolidation
- Centralize all storage keys into STORAGE_KEYS constant
- Update 5 files to use centralized keys:
  * utils/apiClient.ts (AUTH, LEGACY_TOKEN)
  * components/Dashboard/Dashboard.tsx (GUEST_METADATA)
  * components/Docker/DockerHosts.tsx (DOCKER_METADATA)
  * App.tsx (PLATFORMS_SEEN)
  * stores/updates.ts (UPDATES)
- Benefits: Single source of truth, prevents typos, better maintainability

## Previous Work Committed
- Docker monitoring improvements and disk metrics
- Security enhancements and setup fixes
- API refactoring and cleanup
- Documentation updates
- Build system improvements

## Testing
- All frontend tests pass (29 tests)
- All Go tests pass (15 packages)
- Production build successful
- Zero breaking changes

Total: 186 files changed, 5825 insertions(+), 11602 deletions(-)

.dockerignore

@@ -10,8 +10,17 @@ dev-docs/
 # Binaries and build artifacts
 pulse
 backend
+/pulse-host-agent
+/pulse-host-agent-*
+/pulse-docker-agent
+/pulse-server
 bin/
 dist/
+frontend/
+frontend-modern/public/download/
+frontend-modern/public/pulse-host-agent*
+frontend-modern/dist/
+scripts/macos/dist/
 *.exe
 *.dll
 *.so
@@ -45,4 +54,4 @@ testing-tools/
 # Temporary files
 *.tmp
 *.temp
-*~
+*~