fix: 修复 macOS 打包后的图标、spawn ENOENT 和 dylib 路径问题

- 新增 resources/icon.icns（由 public/logo.png 转换）
- package.json: 配置 build.icon 和 build.mac.icon 使用 .icns
- main.ts: BrowserWindow 图标改为平台感知，darwin 用 .icns，其他用 .ico
- keyServiceMac.ts: pgrep/ps/pkill 改用绝对路径，修复打包后 PATH 受限导致的 spawn ENOENT

package.json

@@ -79,7 +79,8 @@
       "hardenedRuntime": false,
       "gatekeeperAssess": false,
       "entitlements": "electron/entitlements.mac.plist",
-      "entitlementsInherit": "electron/entitlements.mac.plist"
+      "entitlementsInherit": "electron/entitlements.mac.plist",
+      "icon": "resources/icon.icns"
     },
     "win": {
       "target": [
@@ -120,6 +121,10 @@
       {
         "from": "electron/assets/wasm/",
         "to": "assets/wasm/"
+      },
+      {
+        "from": "resources/icon.icns",
+        "to": "icon.icns"
       }
     ],
     "files": [
@@ -150,6 +155,7 @@
         "from": "resources/vcruntime140_1.dll",
         "to": "."
       }
-    ]
+    ],
+    "icon": "resources/icon.icns"
   }
 }