diff --git a/.gitea/workflows/bat.yml b/.gitea/workflows/bat.yml
index da5272d..f341719 100644
--- a/.gitea/workflows/bat.yml
+++ b/.gitea/workflows/bat.yml
@@ -1,6 +1,7 @@
 # Gitea Actions workflow for the Rust workspace.
 # This workflow is linux-runner friendly and does not touch real resource
-# directories.
+# directories. It intentionally avoids external GitHub Actions so self-hosted
+# runners do not need to clone action repositories through a network proxy.
 
 name: bat-rust
 
@@ -21,21 +22,35 @@ jobs:
       BAT_SKIP_ENV_FILE: "1"
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        shell: bash
+        run: |
+          set -euo pipefail
+          : "${GITHUB_SERVER_URL:?GITHUB_SERVER_URL is required}"
+          : "${GITHUB_REPOSITORY:?GITHUB_REPOSITORY is required}"
+          : "${GITHUB_SHA:?GITHUB_SHA is required}"
 
-      - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@stable
-        with:
-          components: rustfmt,clippy
+          repo_url="${GITHUB_SERVER_URL%/}/${GITHUB_REPOSITORY}.git"
+          if [ -d .git ]; then
+            git remote set-url origin "${repo_url}" 2>/dev/null || git remote add origin "${repo_url}"
+          else
+            git init .
+            git remote add origin "${repo_url}"
+          fi
+
+          ref="${GITHUB_REF:-${GITHUB_SHA}}"
+          git fetch --no-tags --depth=1 origin "${ref}" || git fetch --no-tags --depth=1 origin "${GITHUB_SHA}"
+          git checkout --force --detach FETCH_HEAD
+          git submodule update --init --recursive
 
       - name: Show tool versions
         shell: bash
         run: |
           set -euo pipefail
+          command -v git
           rustc --version
           cargo --version
-          command -v curl
-          command -v unzip
+          rustfmt --version
+          cargo clippy --version
 
       - name: Check formatting
         shell: bash
diff --git a/docs/guides/development.md b/docs/guides/development.md
index a287106..985a144 100644
--- a/docs/guides/development.md
+++ b/docs/guides/development.md
@@ -23,6 +23,20 @@ rustc --version  # 验证安装
 cargo --version
 ```
 
+#### 自托管 Gitea runner
+
+`.gitea/workflows/bat.yml` 使用 `runs-on: linux`，并且不依赖 `actions/checkout`、`dtolnay/rust-toolchain` 等外部 GitHub Action。runner 需要在执行环境中预装以下命令：
+
+```bash
+git --version
+rustc --version
+cargo --version
+rustfmt --version
+cargo clippy --version
+```
+
+该 workflow 会用 `GITHUB_SERVER_URL`、`GITHUB_REPOSITORY`、`GITHUB_REF` 和 `GITHUB_SHA` 手动 `git fetch` 当前提交，再执行 Rust workspace 的格式化、检查、构建、clippy 和测试。这样可以避免自托管 runner 在准备阶段通过代理克隆第三方 action 仓库。
+
 #### Docker
 ```bash
 # 安装 Docker 和 Docker Compose
diff --git a/docs/reports/CURRENT_GAPS.md b/docs/reports/CURRENT_GAPS.md
index f49b57b..0737f4d 100644
--- a/docs/reports/CURRENT_GAPS.md
+++ b/docs/reports/CURRENT_GAPS.md
@@ -403,6 +403,7 @@
 
 - 明确决策：本项目不加入 GitHub Workflows，也不引入其他托管 CI。
 - 目前补充了自托管 Gitea linux-runner workflow（`.gitea/workflows/bat.yml`），仅用于 Rust workspace 的构建和测试，不改变“不引入托管 CI”的决策。
+- workflow 不使用外部 GitHub Action；它通过 runner 环境变量手动 `git fetch` 当前提交，并要求 runner 预装 `git`、Rust stable、rustfmt 和 clippy，避免准备阶段因第三方 action 仓库代理或网络限制失败。
 - 质量门禁由本地默认验证命令和自托管 workflow 共同承担：提交前执行 `cargo fmt` / `cargo clippy --workspace --all-targets -- -D warnings` / `cargo test --workspace`（见 `docs/guides/development.md` 与 `docs/guides/baseline.md`）。
 - 发布类检查（build、smoke）由 `Makefile` 与 `scripts/` 下的可重复脚本承担（如 `make official-smoke`）。