fix(release): 桌面版版本号跟 git tag 自动联动

之前 electron-builder 从 package.json 取版本号(写死 2.1.4),
导致 dmg/exe 文件名与 git tag(v2.1.5)脱节。

- 两个 electron build job 在构建前用 tag 号同步 package.json
  (npm version --no-git-tag-version),文件名自动跟 tag 走
- bump package.json 到 2.1.5 保持本地一致

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -182,6 +182,15 @@ jobs:
           cd u-claw-app
           npm install --registry=https://registry.npmmirror.com
 
+      - name: Sync version from tag
+        shell: bash
+        run: |
+          tag_name="${GITHUB_REF_NAME:-${{ github.event.inputs.tag }}}"
+          ver="${tag_name#v}"   # strip leading v -> 2.1.5
+          cd u-claw-app
+          npm version "$ver" --no-git-tag-version --allow-same-version
+          echo "桌面版版本号已同步为 $ver"
+
       - name: Build Windows installer
         shell: cmd
         run: |
@@ -213,6 +222,14 @@ jobs:
           cd u-claw-app
           npm install --registry=https://registry.npmmirror.com
 
+      - name: Sync version from tag
+        run: |
+          tag_name="${GITHUB_REF_NAME:-${{ github.event.inputs.tag }}}"
+          ver="${tag_name#v}"   # strip leading v -> 2.1.5
+          cd u-claw-app
+          npm version "$ver" --no-git-tag-version --allow-same-version
+          echo "桌面版版本号已同步为 $ver"
+
       - name: Build macOS DMG
         run: |
           cd u-claw-app

u-claw-app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "u-claw",
-  "version": "2.1.4",
+  "version": "2.1.5",
   "description": "U-Claw - AI 助手桌面版，插上 U 盘就能用",
   "main": "src/main.js",
   "author": "U-Claw <hello@u-claw.org> (https://u-claw.org)",