feat(websearch): add MCP fallback and Gemini CLI hook for third-party profiles

- Add Gemini CLI transformer hook (websearch-gemini-transformer.cjs)
- Implement MCP auto-configuration with web-search-prime, brave, tavily fallback
- Add installWebSearchHook() to activate hook on profile launch
- Update settings.tsx to clarify web-search-prime requires z.ai subscription
- Add WebSearch config types and loader support
- Create implementation plan for WebSearch UX enhancement (startup status, dashboard)

Third-party profiles (gemini, agy, codex, qwen, glm, kimi) now have WebSearch
capability via Gemini CLI primary + MCP fallback chain.

src/ccs.ts

@@ -14,7 +14,7 @@ import { detectClaudeCli } from './utils/claude-detector';
 import { getSettingsPath } from './utils/config-manager';
 import { ErrorManager } from './utils/error-manager';
 import { execClaudeWithCLIProxy, CLIProxyProvider } from './cliproxy';
-import { ensureMcpWebSearch } from './utils/mcp-manager';
+import { ensureMcpWebSearch, installWebSearchHook } from './utils/mcp-manager';
 
 // Import extracted command handlers
 import { handleVersionCommand } from './commands/version-command';
@@ -382,6 +382,7 @@ async function main(): Promise<void> {
       // Settings-based profiles (glm, glmt, kimi) are third-party providers
       // WebSearch is server-side tool - third-party providers have no access
       ensureMcpWebSearch();
+      installWebSearchHook();
 
       // Check if this is GLMT profile (requires proxy)
       if (profileInfo.name === 'glmt') {