feat(setup): implement functional setup wizard with multi-step flow

Add complete setup wizard implementation with the following features:

- Welcome step with feature highlights
- Environment check step with Node.js, OpenClaw, and Gateway verification
- AI Provider selection with API key input and validation UI
- Channel connection step with QR code placeholder
- Skill bundle selection with recommended bundles pre-selected
- Completion summary showing all configured options

Additional changes:
- Add setupComplete state and markSetupComplete action to settings store
- Auto-redirect to setup wizard on first launch
- Track setup completion in persisted settings

src/stores/settings.ts

@@ -28,6 +28,9 @@ interface SettingsState {
   sidebarCollapsed: boolean;
   devModeUnlocked: boolean;
   
+  // Setup
+  setupComplete: boolean;
+  
   // Actions
   setTheme: (theme: Theme) => void;
   setLanguage: (language: string) => void;
@@ -40,6 +43,7 @@ interface SettingsState {
   setAutoDownloadUpdate: (value: boolean) => void;
   setSidebarCollapsed: (value: boolean) => void;
   setDevModeUnlocked: (value: boolean) => void;
+  markSetupComplete: () => void;
   resetSettings: () => void;
 }
 
@@ -55,6 +59,7 @@ const defaultSettings = {
   autoDownloadUpdate: false,
   sidebarCollapsed: false,
   devModeUnlocked: false,
+  setupComplete: false,
 };
 
 export const useSettingsStore = create<SettingsState>()(
@@ -73,6 +78,7 @@ export const useSettingsStore = create<SettingsState>()(
       setAutoDownloadUpdate: (autoDownloadUpdate) => set({ autoDownloadUpdate }),
       setSidebarCollapsed: (sidebarCollapsed) => set({ sidebarCollapsed }),
       setDevModeUnlocked: (devModeUnlocked) => set({ devModeUnlocked }),
+      markSetupComplete: () => set({ setupComplete: true }),
       resetSettings: () => set(defaultSettings),
     }),
     {