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-tauri/src/commands/mod.rs

@@ -19,6 +19,7 @@ mod settings;
 pub mod skill;
 mod stream_check;
 mod sync_support;
+mod toolsearch;
 mod usage;
 mod webdav_sync;
 mod workspace;
@@ -41,6 +42,7 @@ pub use session_manager::*;
 pub use settings::*;
 pub use skill::*;
 pub use stream_check::*;
+pub use toolsearch::*;
 pub use usage::*;
 pub use webdav_sync::*;
 pub use workspace::*;

src-tauri/src/commands/toolsearch.rs

@@ -0,0 +1,21 @@
+#![allow(non_snake_case)]
+
+/// Check Tool Search patch status for the active Claude Code installation
+#[tauri::command]
+pub async fn check_toolsearch_status() -> Result<crate::toolsearch_patch::ToolSearchStatus, String>
+{
+    crate::toolsearch_patch::check_toolsearch_status().map_err(|e| e.to_string())
+}
+
+/// Apply Tool Search patch (bypass domain restriction) to the active installation
+#[tauri::command]
+pub async fn apply_toolsearch_patch() -> Result<Vec<crate::toolsearch_patch::PatchResult>, String> {
+    crate::toolsearch_patch::apply_toolsearch_patch().map_err(|e| e.to_string())
+}
+
+/// Restore Tool Search patch (re-enable domain restriction) for the active installation
+#[tauri::command]
+pub async fn restore_toolsearch_patch() -> Result<Vec<crate::toolsearch_patch::PatchResult>, String>
+{
+    crate::toolsearch_patch::restore_toolsearch_patch().map_err(|e| e.to_string())
+}