feat(config): add system panel with reset and starship theme, add onboarding wizard

- Add PanelSystem with reset config and apply starship theme (charm/zerotwo/default)
- Add OnboardingWizard that activates when profile is empty on first run
- Fix <thing> tag parsing in Shell AI messages (wait for </thing> before rendering)
- Add /api/config/reset and /api/starship/apply-theme endpoints
- Wire wizard trigger in App.jsx based on profile completeness

💘 Generated with Crush

Assisted-by: MiniMax-M2.7 via Crush <crush@charm.land>

web/src/i18n/en.js

@@ -121,6 +121,7 @@ const en = {
       updates: 'Updates',
       locale: 'Language & Keyboard',
       skills: 'Skills',
+      system: 'System',
     },
     profile: 'Profile',
     name: 'Name',
@@ -180,6 +181,12 @@ const en = {
     fontFamily: 'Font Family',
     preview: 'Preview',
     saving: 'Saving...',
+    resetConfig: 'Reset all',
+    resetConfirm: 'Are you sure? All preferences will be erased.',
+    resetDone: 'Settings reset.',
+    applyStarship: 'Apply starship',
+    starshipApplied: 'Starship theme applied! Restart your shell to see the result.',
+    starshipError: 'Failed to apply starship theme.',
   },
 }