diff --git a/.gitea/workflows/ci-pipeline.yml b/.gitea/workflows/ci-pipeline.yml
index 07d3d0223..e834fb87d 100755
--- a/.gitea/workflows/ci-pipeline.yml
+++ b/.gitea/workflows/ci-pipeline.yml
@@ -58,24 +58,56 @@ jobs:
       run: |
         set -eu
         PR_NUMBER=$(echo "$GITHUB_REF" | sed 's|refs/pull/||; s|/.*||')
-        API_URL="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}/files?limit=300"
-        FILES=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" "$API_URL" | python3 -c "import sys,json; [print(f['filename']) for f in json.load(sys.stdin)]")
-        FRONTEND_COUNT=$(echo "$FILES" | grep -c '^apps/web/' || true)
-        BACKEND_COUNT=$(echo "$FILES" | grep -cv '^apps/web/' || true)
-        TOTAL=$(echo "$FILES" | grep -cv '^$' || true)
-        echo "变更文件: ${TOTAL} 个 (前端: ${FRONTEND_COUNT}, 后端/公共: ${BACKEND_COUNT})"
-        if [ "$BACKEND_COUNT" = "0" ] && [ "$FRONTEND_COUNT" -gt "0" ]; then
+
+        # 分页获取所有变更文件（修复>300文件时漏判）
+        ALL_FILES=""
+        PAGE=1
+        while true; do
+          API_URL="${GITHUB_API_URL}/repos/${GITHUB_REPOSITORY}/pulls/${PR_NUMBER}/files?limit=300&page=${PAGE}"
+          PAGE_FILES=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" "$API_URL" | python3 -c "import sys,json; files=json.load(sys.stdin); [print(f['filename']) for f in files]; sys.exit(0 if len(files)==300 else 1)" 2>/dev/null || true)
+          PAGE_COUNT=$(echo "$PAGE_FILES" | wc -l)
+          if [ "$PAGE_COUNT" -lt 300 ]; then HAS_MORE=1; else HAS_MORE=0; fi
+          ALL_FILES="${ALL_FILES}${PAGE_FILES}"$'\n'
+          if [ "$HAS_MORE" != "0" ]; then
+            break
+          fi
+          PAGE=$((PAGE + 1))
+        done
+
+        FRONTEND_COUNT=$(echo "$ALL_FILES" | grep -c '^apps/web/' || true)
+        TOTAL=$(echo "$ALL_FILES" | grep -cv '^$' || true)
+        BACKEND_COUNT=$(( TOTAL - FRONTEND_COUNT ))
+
+        # 基础设施文件：改了就强制全量CI（不跳过任何检查）
+        INFRA_COUNT=$(echo "$ALL_FILES" | grep -cE '^(infra/|Dockerfile|\.gitea/workflows/|scripts/ci/|docker/)' || true)
+
+        echo "变更文件: ${TOTAL} 个 (前端: ${FRONTEND_COUNT}, 后端/公共: ${BACKEND_COUNT}, 基础设施: ${INFRA_COUNT})"
+
+        # 判定是否纯前端/纯后端
+        PURE_FRONTEND=false
+        PURE_BACKEND=false
+        if [ "$BACKEND_COUNT" = "0" ] && [ "$FRONTEND_COUNT" -gt "0" ] && [ "$INFRA_COUNT" = "0" ]; then
+          PURE_FRONTEND=true
+        elif [ "$FRONTEND_COUNT" = "0" ] && [ "$BACKEND_COUNT" -gt "0" ] && [ "$INFRA_COUNT" = "0" ]; then
+          PURE_BACKEND=true
+        fi
+
+        if [ "$PURE_FRONTEND" = "true" ]; then
           echo "skip_backend=true" >> $GITHUB_OUTPUT
           echo "skip_frontend=false" >> $GITHUB_OUTPUT
           echo "✅ 纯前端改动，跳过后端检查"
-        elif [ "$FRONTEND_COUNT" = "0" ] && [ "$BACKEND_COUNT" -gt "0" ]; then
+        elif [ "$PURE_BACKEND" = "true" ]; then
           echo "skip_backend=false" >> $GITHUB_OUTPUT
           echo "skip_frontend=true" >> $GITHUB_OUTPUT
           echo "🔧 纯后端改动，跳过前端检查"
         else
           echo "skip_backend=false" >> $GITHUB_OUTPUT
           echo "skip_frontend=false" >> $GITHUB_OUTPUT
-          echo "🔧 包含全栈变更，运行完整CI"
+          if [ "$INFRA_COUNT" -gt "0" ]; then
+            echo "🏗️  包含基础设施变更，强制运行完整CI"
+          else
+            echo "🔧 包含全栈变更，运行完整CI"
+          fi
         fi
 
     - name: Report CI trace