diff --git a/.gitea/workflows/pr-automation.yml b/.gitea/workflows/pr-automation.yml
index 9f54cd31c..b107783bf 100755
--- a/.gitea/workflows/pr-automation.yml
+++ b/.gitea/workflows/pr-automation.yml
@@ -240,9 +240,6 @@ jobs:
               "CI/CD Pipeline / Validate - Type Check (mypy) (pull_request)"
               "CI/CD Pipeline / Validate - Migration (alembic) (pull_request)"
               "CI/CD Pipeline / Frontend Lint (pull_request)"
-              "CI/CD Pipeline / PR Build API Image (pull_request)"
-              "CI/CD Pipeline / PR Build Worker Image (pull_request)"
-              "CI/CD Pipeline / PR Build Web Image (pull_request)"
             )
             echo "检查required门禁（与分支保护一致）"
           fi
diff --git a/scripts/ci/docker_build_only.sh b/scripts/ci/docker_build_only.sh
index ad5c78e4b..d0aaa18d7 100755
--- a/scripts/ci/docker_build_only.sh
+++ b/scripts/ci/docker_build_only.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
-# PR构建专用：只构建不推送，只读缓存不写，用于PR阶段验证Dockerfile
+# PR构建专用：只构建不输出，验证Dockerfile能否正常构建
+# 无本地缓存（12个runner不共享，反而添乱），只用ACR远程缓存
 set -eu
 
 NO_CACHE_FLAG=""
@@ -25,60 +26,18 @@ else
 fi
 docker buildx inspect --bootstrap
 
-CACHE_NAME=$(echo "$CACHE_REF" | tr "/" "_" | tr ":" "-")
-LOCAL_CACHE_DIR="/tmp/buildx-cache/${CACHE_NAME}"
-mkdir -p "$LOCAL_CACHE_DIR"
-
-echo "=== PR Build: build only, no push, read-only cache ==="
+echo "=== PR Build: build only, no output, remote cache only ==="
 echo "Dockerfile: ${DOCKERFILE}"
 echo "Image tag: ${IMAGE_TAG}"
 echo ""
 
-build_with_retry() {
-  local attempt=1
-  local max_attempts=2
-  while [ $attempt -le $max_attempts ]; do
-    local build_output
-    local exit_code
-    set +e
-    build_output=$(docker buildx build \
-      $NO_CACHE_FLAG \
-      $BUILD_ARGS \
-      --cache-from "type=local,src=${LOCAL_CACHE_DIR}" \
-      --cache-from "type=registry,ref=${CACHE_REF}" \
-      -f "${DOCKERFILE}" \
-      -t "${IMAGE_TAG}" \
-      --load \
-      . 2>&1)
-    exit_code=$?
-    set -e
-    if [ $exit_code -eq 0 ]; then
-      echo "$build_output"
-      return 0
-    fi
-    if echo "$build_output" | grep -qE "parent snapshot.*not found|snapshot.*does not exist|cache.*corrupt|failed to compute cache key"; then
-      echo "$build_output"
-      echo "Local cache corrupted, cleaning and retrying ($attempt/$max_attempts)..."
-      rm -rf "${LOCAL_CACHE_DIR}"
-      mkdir -p "${LOCAL_CACHE_DIR}"
-      docker buildx prune -f -a >/dev/null 2>&1 || true
-      attempt=$((attempt + 1))
-    else
-      echo "$build_output"
-      return $exit_code
-    fi
-  done
-  echo "Local cache failed, building with registry cache only..."
-  docker buildx build \
-    $NO_CACHE_FLAG \
-    $BUILD_ARGS \
-    --cache-from "type=registry,ref=${CACHE_REF}" \
-    -f "${DOCKERFILE}" \
-    -t "${IMAGE_TAG}" \
-    --load \
-    .
-}
+docker buildx build \
+  $NO_CACHE_FLAG \
+  $BUILD_ARGS \
+  --cache-from "type=registry,ref=${CACHE_REF}" \
+  -f "${DOCKERFILE}" \
+  -t "${IMAGE_TAG}" \
+  .
 
-build_with_retry
 echo ""
-echo "PR build OK (not pushed): ${IMAGE_TAG}"
+echo "PR build OK (build only, no output): ${IMAGE_TAG}"
diff --git a/scripts/ci/vitest_incremental.sh b/scripts/ci/vitest_incremental.sh
old mode 100644
new mode 100755
index a91500730..7c5e73c59
--- a/scripts/ci/vitest_incremental.sh
+++ b/scripts/ci/vitest_incremental.sh
@@ -1,15 +1,12 @@
 #!/bin/bash
-# Vitest 增量执行脚本
+# Vitest 增量执行脚本（在Docker Node容器中运行）
 # PR模式下只跑与改动文件相关的测试，大幅节省时间
-# 用法: bash scripts/ci/vitest_incremental.sh
 set -eu
 
-cd apps/web
-
 # 如果不是PR事件，直接全量跑
 if [ "${GITHUB_EVENT_NAME:-}" != "pull_request" ]; then
   echo "非PR模式，全量执行Vitest"
-  npx --no-install vitest run --coverage
+  bash scripts/ci/step_frontend_run.sh "npx vitest run --coverage"
   exit $?
 fi
 
@@ -17,7 +14,7 @@ fi
 PR_NUMBER=$(echo "${GITHUB_REF:-}" | sed 's|refs/pull/||; s|/.*||')
 if [ -z "$PR_NUMBER" ]; then
   echo "无法获取PR编号，全量执行Vitest"
-  npx --no-install vitest run --coverage
+  bash scripts/ci/step_frontend_run.sh "npx vitest run --coverage"
   exit $?
 fi
 
@@ -29,9 +26,7 @@ try:
     web_files = []
     for f in files:
         fname = f['filename']
-        # 只关注前端源码文件
         if fname.startswith('apps/web/src/') and fname.endswith(('.ts', '.tsx', '.js', '.jsx')) and f['status'] != 'removed':
-            # 去掉apps/web/前缀，变成相对路径
             web_files.append(fname.replace('apps/web/', ''))
     print(' '.join(web_files))
 except Exception as e:
@@ -40,36 +35,33 @@ except Exception as e:
 
 if [ -z "$CHANGED_FILES" ]; then
   echo "PR未改动前端源码文件，跳过Vitest"
-  echo "（如果配置了前端单测门禁，请确保至少有一个相关测试）"
   exit 0
 fi
 
 FILE_COUNT=$(echo "$CHANGED_FILES" | wc -w)
 echo "PR改动了 $FILE_COUNT 个前端文件"
-echo "改动文件: $CHANGED_FILES"
 
 # 如果改动文件太多（超过30个），全量跑更可靠
 if [ "$FILE_COUNT" -gt 30 ]; then
-  echo "改动文件较多（>$FILE_COUNT），降级为全量执行以确保覆盖"
-  npx --no-install vitest run --coverage
+  echo "改动文件较多，全量执行Vitest"
+  bash scripts/ci/step_frontend_run.sh "npx vitest run --coverage"
   exit $?
 fi
 
-# 使用vitest related 跑增量测试（子命令，非flag）
 echo ""
 echo "=== 增量执行 Vitest（只跑相关测试）==="
 echo "相关源文件: $CHANGED_FILES"
 echo ""
 
+# 在Docker Node容器中执行增量测试
 set +e
-npx --no-install vitest run related $CHANGED_FILES
+bash scripts/ci/step_frontend_run.sh "npx vitest run related $CHANGED_FILES"
 VITEST_EXIT=$?
 set -e
 
 if [ "$VITEST_EXIT" -eq 0 ]; then
   echo ""
   echo "✅ 增量测试通过"
-  echo "（仅覆盖与改动相关的测试用例）"
   exit 0
 else
   echo ""