fix: replace actions/checkout@v4 with local git clone from Gitea

CI runner in China can't reach GitHub to download the checkout action.
Clone directly from internal Gitea container (http://gitea:3000) instead.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/workflows/deploy.yml

@@ -19,9 +19,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 1
+        run: |
+          if [ ! -d .git ]; then
+            git clone --depth=1 "http://gitea:3000/${GITHUB_REPOSITORY}.git" .
+          fi
 
       - name: Setup Python
         run: |
@@ -96,9 +97,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 1
+        run: |
+          if [ ! -d .git ]; then
+            git clone --depth=1 "http://gitea:3000/${GITHUB_REPOSITORY}.git" .
+          fi
 
       - name: Setup Node.js
         run: |
@@ -167,9 +169,10 @@ jobs:
         - /volume1/docker/nas-dashboard:/nas-dashboard
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
-        with:
-          fetch-depth: 1
+        run: |
+          if [ ! -d .git ]; then
+            git clone --depth=1 "http://gitea:3000/${GITHUB_REPOSITORY}.git" .
+          fi
 
       - name: Warm mirror cache for base images
         run: |