fix: limit deep-link permission to macOS only

tauri-plugin-deep-link does not register permissions on Windows
or Linux (both use CLI args for deep links). Only macOS uses
the event-based deep link system that requires permissions.

src-tauri/capabilities/deep-link.json

@@ -1,9 +1,9 @@
 {
   "$schema": "../gen/schemas/desktop-schema.json",
   "identifier": "deep-link",
-  "description": "Deep link 权限（仅 macOS 和 Windows）",
+  "description": "Deep link 权限（仅 macOS）",
   "windows": ["main"],
-  "platforms": ["macOS", "windows"],
+  "platforms": ["macOS"],
   "permissions": [
     "deep-link:default"
   ]