fix(service-monitor): 过滤无效检测值，修复 bash 脚本检测逻辑

- parser.py: 新增 _INVALID_VALUES 过滤 N/A、无法获取、未知等无效值
- 01_system_basic.sh: 修复 check_command 函数不存在，改用 command -v
- 02_cpu_check.sh: 修复 SCHEDULER_RUNQUEUE 取值逻辑，适配新版内核
Co-Authored-By: Claude <noreply@anthropic.com>

skill/code/web/service_monitor/assets/system/01_system_basic.sh

@@ -117,14 +117,13 @@ check_architecture() {
 # 检测系统资源限制
 check_ulimit() {
     local ulimit_info=""
-    if check_command ulimit; then
+    if command -v ulimit &>/dev/null; then
         ulimit_info=$(ulimit -a 2>/dev/null | head -20 | tr '\n' ',' | sed 's/,$//')
     fi
     if [ -n "$ulimit_info" ]; then
         output_result "ULIMIT_INFO" "$ulimit_info"
-    else
-        output_result "ULIMIT_INFO" "无法获取"
     fi
+    # 无法获取时不输出，让 parser 忽略
 }
 
 # 检测内核启动参数

skill/code/web/service_monitor/assets/system/02_cpu_check.sh

@@ -185,13 +185,16 @@ check_softirqs() {
 # 检测CPU调度器运行队列长度
 check_scheduler_runqueue() {
     local runqueue
-    runqueue=$(awk '/runnable/ {print $2}' /proc/stat 2>/dev/null)
+    # 新版内核 /proc/stat 格式变化，尝试多种方式获取
+    runqueue=$(awk '/^procs_running/ {print $2}' /proc/stat 2>/dev/null)
+    if [ -z "$runqueue" ]; then
+        runqueue=$(grep -oP 'runnable\s+\K\d+' /proc/stat 2>/dev/null)
+    fi
 
     if [ -n "$runqueue" ]; then
         output_result "SCHEDULER_RUNQUEUE" "$runqueue"
-    else
-        output_result "SCHEDULER_RUNQUEUE" "未知"
     fi
+    # 无法获取时不输出
 }
 
 # 检测进程CPU亲和性示例

skill/code/web/service_monitor/utils/parser.py

@@ -36,6 +36,18 @@ _VALUE_STATUS_MAP = {
     "严重": CRITICAL, "ERROR": CRITICAL, "异常": CRITICAL, "未运行": CRITICAL,
 }
 
+# 无效值/未安装占位符（这些值表示服务未安装或检测失败，不作为正常检测项）
+_INVALID_VALUES = {
+    "", "N/A", "n/a", "NA", "null", "None", "none",
+    "获取失败", "无法获取", "未知", "未检测", "不支持",
+    "服务未安装", "容器未运行", "未找到", "不存在",
+}
+
+
+def _is_invalid_value(value: str) -> bool:
+    """判断值是否为无效/未安装占位符。"""
+    return value.strip() in _INVALID_VALUES
+
 
 @dataclass
 class CheckItem:
@@ -108,6 +120,9 @@ def parse_module_output(raw: str, module_id: str, category: str) -> List[CheckIt
         if key.endswith("_LEVEL"):
             continue
         value = raw_map[key]
+        # 跳过无效值（服务未安装、检测失败等）
+        if _is_invalid_value(value):
+            continue
         name = DISPLAY_NAMES.get(key, key)
         threshold = THRESHOLDS.get(key, "")
         status = _resolve_status(key, value, raw_map)