fix(ci): 修复 migration diff step 失败 - 增加容错避免阻断 CI

- Prepare git for migration diff step 改为 set +e + exit 0
- 该 step 失败不影响后续检查（Check migration safety 有全量检查 fallback）
- 解决 tarball checkout 环境下 git init/commit 失败导致 Validate 全挂的问题

.gitea/workflows/ci-cd.yml

@@ -96,7 +96,7 @@ jobs:
       shell: sh
       env:
         GITHUB_TOKEN: ${{ github.token }}
-      run: "set -eu\nSCAN_MODE=\"full\"\nCHANGED_PY_FILES=\"\"\n\nif [ \"${GITHUB_EVENT_NAME:-}\" = \"pull_request\" ] && [ -n \"${GITHUB_BASE_REF:-}\" ]; then\n  echo \"PR mode (base: ${GITHUB_BASE_REF}) - preparing incremental scan\"\n  git init -q\n  git config user.email \"ci@localhost\"\n  git config user.name \"CI\"\n  git add .\n  git commit -q -m \"current\"\n  REPO_URL=\"https://x-access-token:${GITHUB_TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git\"\n  git remote add origin \"$REPO_URL\"\n  if git fetch origin \"${GITHUB_BASE_REF}\" --depth=50 -q 2>/dev/null; then\n    CHANGED_PY_FILES=$(git diff --name-only --diff-filter=ACMRT \"origin/${GITHUB_BASE_REF}\" HEAD -- '*.py' 2>/dev/null | tr '\\n' ' ')\n    if [ -n \"$CHANGED_PY_FILES\" ]; then\n      SCAN_MODE=\"incremental\"\n      FILE_COUNT=$(echo \"$CHANGED_PY_FILES\" | wc -w)\n      echo \"Changed Python files: ${FILE_COUNT}\"\n      echo \"$CHANGED_PY_FILES\" | tr ' ' '\\n' | grep -v '^$'\n    else\n      SCAN_MODE=\"skip_py\"\n      echo \"No Python files changed in this PR\"\n    fi\n  else\n    echo \"WARN: failed to fetch base branch, falling back to full scan\"\n  fi\nelse\n  echo \"Full scan mode (not a PR event)\"\nfi\n\necho \"SCAN_MODE=$SCAN_MODE\" >> $GITHUB_ENV\necho \"CHANGED_PY_FILES=$CHANGED_PY_FILES\" >> $GITHUB_ENV\n"
+      run: "set -eu\nSCAN_MODE=\"full\"\nCHANGED_PY_FILES=\"\"\n\nif [ \"${GITHUB_EVENT_NAME:-}\" = \"pull_request\" ] && [ -n \"${GITHUB_REF_NAME:-}\" ]; then\n  echo \"PR mode (#${GITHUB_REF_NAME}) - fetching changed files from API\"\n\n  PR_NUMBER=$(echo \"$GITHUB_REF\" | sed 's|refs/pull/||; s|/.*||')\n  API_URL=\"${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}/files?limit=100\"\n\n  set +e\n  RESPONSE=$(curl -s -w \"\\n%{http_code}\" -H \"Authorization: token ${GITHUB_TOKEN}\" \"${API_URL}\")\n  HTTP_CODE=$(echo \"$RESPONSE\" | tail -n1)\n  BODY=$(echo \"$RESPONSE\" | sed '$d')\n  set -e\n\n  if [ \"$HTTP_CODE\" = \"200\" ]; then\n    CHANGED_PY_FILES=$(echo \"$BODY\" | python3 -c \"\nimport json, sys\ntry:\n    files = json.load(sys.stdin)\n    py_files = [f['filename'] for f in files\n                if f['filename'].endswith('.py') and f['status'] != 'removed']\n    print(' '.join(py_files))\nexcept Exception:\n    print('')\n\")\n    if [ -n \"$CHANGED_PY_FILES\" ]; then\n      SCAN_MODE=\"incremental\"\n      FILE_COUNT=$(echo \"$CHANGED_PY_FILES\" | wc -w)\n      echo \"Changed Python files: ${FILE_COUNT}\"\n      echo \"$CHANGED_PY_FILES\" | tr ' ' '\\n' | grep -v '^$'\n    else\n      SCAN_MODE=\"skip_py\"\n      echo \"No Python files changed in this PR\"\n    fi\n  else\n    echo \"WARN: API returned HTTP $HTTP_CODE, falling back to full scan\"\n  fi\nelse\n  echo \"Full scan mode (not a PR event)\"\nfi\n\necho \"SCAN_MODE=$SCAN_MODE\" >> $GITHUB_ENV\necho \"CHANGED_PY_FILES=$CHANGED_PY_FILES\" >> $GITHUB_ENV\n"
     - name: Run code quality checks
       shell: sh
       run: "set -eu\n\nif [ \"$SCAN_MODE\" = \"incremental\" ]; then\n  echo \"=== Incremental scan mode ===\"\n\n  python3 -m compileall -q $CHANGED_PY_FILES\n\n  python3 -m black --check --fast $CHANGED_PY_FILES\n\n  python3 -m isort --check-only $CHANGED_PY_FILES\n\n  RUFF_FILES=$(echo \"$CHANGED_PY_FILES\" | tr ' ' '\\n' | grep -v '^scripts/' | tr '\\n' ' ')\n  if [ -n \"$RUFF_FILES\" ]; then\n    python3 -m ruff check $RUFF_FILES --statistics\n  else\n    echo \"No ruff-checkable files changed, skipping\"\n  fi\n\nelif [ \"$SCAN_MODE\" = \"skip_py\" ]; then\n  echo \"No Python files changed - skipping Python lint checks\"\n\nelse\n  echo \"=== Full scan mode ===\"\n\n  python3 -m compileall -q alembic apps packages tests scripts\n\n  python3 -m black --check --fast alembic apps packages tests scripts\n\n  python3 -m isort --check-only alembic apps packages tests scripts\n\n  python3 -m ruff check apps packages tests --statistics\nfi\n"
@@ -146,7 +146,7 @@ jobs:
       shell: sh
       env:
         GITHUB_TOKEN: ${{ github.token }}
-      run: "set -eu\nif command -v git >/dev/null 2>&1; then\n  if [ ! -d .git ]; then\n    git init -q\n    git config user.email \"ci@localhost\"\n    git config user.name \"CI\"\n    git add .\n    git commit -q -m \"current\"\n    REPO_URL=\"https://x-access-token:${GITHUB_TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git\"\n    git remote add origin \"$REPO_URL\"\n  fi\n  git fetch origin main --depth=1 -q 2>/dev/null || echo \"WARN: cannot fetch main, will check all migrations\"\nelse\n  echo \"WARN: git not available, will check all migrations\"\nfi\n"
+      run: "set +e\nif command -v git >/dev/null 2>&1; then\n  if [ ! -d .git ]; then\n    git init -q\n    git config user.email \"ci@localhost\"\n    git config user.name \"CI\"\n    git add .\n    git commit -q -m \"current\"\n    REPO_URL=\"https://x-access-token:${GITHUB_TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git\"\n    git remote add origin \"$REPO_URL\"\n  fi\n  git fetch origin main --depth=1 -q 2>/dev/null || echo \"WARN: cannot fetch main, will check all migrations\"\nelse\n  echo \"WARN: git not available, will check all migrations\"\nfi\nexit 0\n"
     - name: Check migration safety
       shell: sh
       run: "set -eu\nif git rev-parse origin/main >/dev/null 2>&1; then\n  python3 scripts/check_migration_safety.py --allow-medium-risk --diff-against origin/main\nelse\n  python3 scripts/check_migration_safety.py --allow-medium-risk\nfi\n"