♻️ refactor(ci): 将 GIT_CONFIG 环境变量改为内联 -c 认证

- 删除三个 workflow env 段的 GIT_CONFIG_COUNT/KEY/VALUE 变量
- 在需要认证的 git 命令上内联 -c credential.helper/interactive
- prepare fetch、stats 两处 push、release push 各自内联
- 保留 ACCESS_TOKEN，helper 运行时取用

.gitea/workflows/update_stats_badge.yml

@@ -17,13 +17,6 @@ env:
   # ===== Token 配置 =====
   # 请在 Settings -> Secrets 中配置 WORKFLOW secret
   ACCESS_TOKEN: ${{ secrets.WORKFLOW }}
-  GIT_CONFIG_COUNT: "3"
-  GIT_CONFIG_KEY_0: "credential.helper"
-  GIT_CONFIG_VALUE_0: ""
-  GIT_CONFIG_KEY_1: "credential.helper"
-  GIT_CONFIG_VALUE_1: '!f() { test "$1" = get || exit 0; printf "%s\n" username=oauth2; printf "%s\n" "password=${ACCESS_TOKEN}"; }; f'
-  GIT_CONFIG_KEY_2: "credential.interactive"
-  GIT_CONFIG_VALUE_2: "never"
 
   # ===== 工作区配置 =====
   WORKSPACE_ROOT: "/data/workspace"
@@ -287,7 +280,11 @@ jobs:
           git commit -m ":bar_chart: chore(stats): 初始化统计分支"
 
           # 推送到远程
-          git -C "${{ env.REPO_DIR }}" push origin "${{ env.BADGE_BRANCH }}"
+          git -C "${{ env.REPO_DIR }}" \
+            -c credential.helper= \
+            -c 'credential.helper=!f() { test "$1" = get || exit 0; printf "%s\n" username=oauth2; printf "%s\n" "password=${ACCESS_TOKEN}"; }; f' \
+            -c credential.interactive=never \
+            push origin "${{ env.BADGE_BRANCH }}"
 
           echo "✅ 统计分支创建完成"
           echo "======================================"
@@ -522,7 +519,11 @@ jobs:
             echo "📤 推送到远程 ${{ env.BADGE_BRANCH }} 分支..."
 
             # 推送到远程（使用 TOKEN）
-            if git -C "${{ env.REPO_DIR }}" push origin "${{ env.BADGE_BRANCH }}"; then
+            if git -C "${{ env.REPO_DIR }}" \
+              -c credential.helper= \
+              -c 'credential.helper=!f() { test "$1" = get || exit 0; printf "%s\n" username=oauth2; printf "%s\n" "password=${ACCESS_TOKEN}"; }; f' \
+              -c credential.interactive=never \
+              push origin "${{ env.BADGE_BRANCH }}"; then
               echo "✅ 推送成功"
               echo "changed=true" >> $GITHUB_OUTPUT
             else