ci: checkout 改為完整歷史（fetch-depth: 0）

預設淺層 clone 只有一個 commit，Claude 需要完整歷史才能比對分支與產生 diff。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitea/workflows/claude.yml

@@ -0,0 +1,27 @@
+name: Claude Assistant
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned, labeled]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  claude-response:
+    runs-on: yellow-zeabur-runner
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: markwylde/claude-code-gitea-action@v1.0.20
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          gitea_token: ${{ secrets.USER_TOKEN }}
+          claude_git_name: Claude
+          claude_git_email: claude@anthropic.com
+          path_to_claude_code_executable: /usr/local/bin/claude
+        env:
+          GITEA_SERVER_URL: https://yellow-git.zeabur.app