feat: 添加 cacheWarningEnabled 配置项，支持在 /config 面板关闭缓存率警告

src/utils/cacheWarning.ts

@@ -40,6 +40,14 @@ export function getCacheThreshold(): number {
   return settings.cacheThreshold ?? DEFAULT_CACHE_THRESHOLD
 }
 
+/**
+ * 检查缓存警告是否启用。默认 true。
+ */
+export function isCacheWarningEnabled(): boolean {
+  const settings = getInitialSettings()
+  return settings.cacheWarningEnabled ?? true
+}
+
 /**
  * 计算缓存命中率
  * 返回值范围 0-100，null 表示无有效数据

src/utils/settings/types.ts

@@ -1089,6 +1089,12 @@ export const SettingsSchema = lazySchema(() =>
         .describe(
           'Prompt cache hit rate threshold (0-100). Warnings shown when cache hit rate falls below this percentage. Default: 80.',
         ),
+      cacheWarningEnabled: z
+        .boolean()
+        .optional()
+        .describe(
+          'Whether to show cache hit rate warnings in the message flow when the rate falls below cacheThreshold. Default: true.',
+        ),
       pluginTrustMessage: z
         .string()
         .optional()