feat(websearch): add Grok CLI support and improve install guidance

- Add Grok CLI detection (grok-4-cli by lalomorales22) alongside Gemini CLI
- Add WebSearch health check group to health-service.ts
- Update settings UI to show both Gemini and Grok CLI providers
- Add detailed install hints when no WebSearch CLI is installed
- Update API routes to return grokCli status
- Both CLI and dashboard users now see clear installation guidance

Providers:
- Gemini CLI: FREE tier (1000 req/day), no API key needed
- Grok CLI: Requires xAI API key (XAI_API_KEY), web + X search

src/utils/shell-executor.ts

@@ -6,6 +6,7 @@
 
 import { spawn, ChildProcess } from 'child_process';
 import { ErrorManager } from './error-manager';
+import { getWebSearchHookEnv } from './websearch-manager';
 
 /**
  * Escape arguments for shell execution (Windows compatibility)
@@ -25,8 +26,13 @@ export function execClaude(
   const isWindows = process.platform === 'win32';
   const needsShell = isWindows && /\.(cmd|bat|ps1)$/i.test(claudeCli);
 
+  // Get WebSearch hook config env vars
+  const webSearchEnv = getWebSearchHookEnv();
+
   // Prepare environment (merge with process.env if envVars provided)
-  const env = envVars ? { ...process.env, ...envVars } : process.env;
+  const env = envVars
+    ? { ...process.env, ...envVars, ...webSearchEnv }
+    : { ...process.env, ...webSearchEnv };
 
   let child: ChildProcess;
   if (needsShell) {