feat: add Tool Search domain restriction bypass with active-installation patching

Resolve the active `claude` command from PATH and apply an equal-length
byte patch to remove the domain whitelist check. Backups are stored in
~/.cc-switch/toolsearch-backups/ (SHA-256 of path) so they survive
Claude Code version upgrades. The patch auto-reapplies on app startup
when the setting is enabled.

Frontend checks PatchResult.success and rolls back the setting on failure.

src/hooks/useSettings.ts

@@ -197,6 +197,44 @@ export function useSettings(): UseSettingsResult {
           }
         }
 
+        // Tool Search bypass: apply/restore patch when toggled
+        const nextToolSearchBypass = updates.toolSearchBypass;
+        if (
+          nextToolSearchBypass !== undefined &&
+          nextToolSearchBypass !== (data?.toolSearchBypass ?? false)
+        ) {
+          try {
+            const results = nextToolSearchBypass
+              ? await settingsApi.applyToolSearchPatch()
+              : await settingsApi.restoreToolSearchPatch();
+            const failed = results.find((r) => !r.success);
+            if (failed) {
+              throw new Error(failed.error ?? "Tool Search patch failed");
+            }
+          } catch (error) {
+            console.warn(
+              "[useSettings] Failed to sync Tool Search bypass",
+              error,
+            );
+            // Rollback: revert the setting we already saved
+            const rolledBack = {
+              ...payload,
+              toolSearchBypass: !nextToolSearchBypass,
+            };
+            await saveMutation.mutateAsync(rolledBack);
+            updateSettings({ toolSearchBypass: !nextToolSearchBypass });
+            toast.error(
+              nextToolSearchBypass
+                ? t("notifications.toolSearchPatchFailed", {
+                    defaultValue: "Tool Search 补丁操作失败",
+                  })
+                : t("notifications.toolSearchRestoreFailed", {
+                    defaultValue: "Tool Search 恢复操作失败",
+                  }),
+            );
+          }
+        }
+
         // 持久化语言偏好
         try {
           if (typeof window !== "undefined" && updates.language) {
@@ -228,7 +266,7 @@ export function useSettings(): UseSettingsResult {
         throw error;
       }
     },
-    [data, saveMutation, settings, t],
+    [data, saveMutation, settings, t, updateSettings],
   );
 
   // 完整保存设置（用于 Advanced 标签页的手动保存）

src/hooks/useSettingsForm.ts

@@ -85,6 +85,7 @@ export function useSettingsForm(): UseSettingsFormResult {
         data.enableClaudePluginIntegration ?? false,
       silentStartup: data.silentStartup ?? false,
       skipClaudeOnboarding: data.skipClaudeOnboarding ?? false,
+      toolSearchBypass: data.toolSearchBypass ?? false,
       claudeConfigDir: sanitizeDir(data.claudeConfigDir),
       codexConfigDir: sanitizeDir(data.codexConfigDir),
       geminiConfigDir: sanitizeDir(data.geminiConfigDir),
@@ -107,6 +108,7 @@ export function useSettingsForm(): UseSettingsFormResult {
             minimizeToTrayOnClose: true,
             enableClaudePluginIntegration: false,
             skipClaudeOnboarding: false,
+            toolSearchBypass: false,
             language: readPersistedLanguage(),
           } as SettingsFormState);
 
@@ -143,6 +145,7 @@ export function useSettingsForm(): UseSettingsFormResult {
           serverData.enableClaudePluginIntegration ?? false,
         silentStartup: serverData.silentStartup ?? false,
         skipClaudeOnboarding: serverData.skipClaudeOnboarding ?? false,
+        toolSearchBypass: serverData.toolSearchBypass ?? false,
         claudeConfigDir: sanitizeDir(serverData.claudeConfigDir),
         codexConfigDir: sanitizeDir(serverData.codexConfigDir),
         geminiConfigDir: sanitizeDir(serverData.geminiConfigDir),