feat: 支持4种OpenBridge主题切换，统一项目命名和端口配置

- 添加 OpenBridge 四种主题切换 (day/bright/dusk/night)
- 实现 DJB2 hash 算法生成项目专用端口 (14323)
- 统一项目名称为 openbridge-token-usage-viewer
- 更新 Tauri 应用名称、sidecar 命名和窗口标题
- 开发服务器端口从 3000 改为基于项目名称的稳定端口

src-tauri/tauri.conf.json

@@ -1,8 +1,8 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
-  "productName": "app-desktop",
+  "productName": "openbridge-token-usage-viewer",
   "version": "0.1.0",
-  "identifier": "com.imbytecat.app-desktop",
+  "identifier": "com.imbytecat.openbridge-token-usage-viewer",
   "app": {
     "withGlobalTauri": true,
     "windows": [],
@@ -20,6 +20,6 @@
       "icons/icon.icns",
       "icons/icon.ico"
     ],
-    "externalBin": ["binaries/app"]
+    "externalBin": ["binaries/openbridge-token-usage-viewer"]
   }
 }