diff --git a/messages/en/settings.json b/messages/en/settings.json
index 51a8cac30..a825d4cda 100644
--- a/messages/en/settings.json
+++ b/messages/en/settings.json
@@ -608,6 +608,7 @@
         "copySuccess": "Copied to clipboard",
         "copyFailed": "Failed to copy",
         "copyResult": "Copy Result",
+        "close": "Close",
         "success": "Success",
         "failed": "Failed"
       },
diff --git a/messages/zh-CN/settings.json b/messages/zh-CN/settings.json
index 1724e3a73..dc1a7aaa6 100644
--- a/messages/zh-CN/settings.json
+++ b/messages/zh-CN/settings.json
@@ -242,6 +242,7 @@
         "copySuccess": "已复制到剪贴板",
         "copyFailed": "复制失败",
         "copyResult": "复制结果",
+        "close": "关闭",
         "success": "成功",
         "failed": "失败"
       },
diff --git a/messages/zh-TW/settings.json b/messages/zh-TW/settings.json
index 2abac1326..12fb94da2 100644
--- a/messages/zh-TW/settings.json
+++ b/messages/zh-TW/settings.json
@@ -600,6 +600,7 @@
         "copySuccess": "已複製到剪貼簿",
         "copyFailed": "複製失敗",
         "copyResult": "複製結果",
+        "close": "關閉",
         "success": "成功",
         "failed": "失敗"
       },
diff --git a/src/actions/providers.ts b/src/actions/providers.ts
index f88a3cb04..dd9348468 100644
--- a/src/actions/providers.ts
+++ b/src/actions/providers.ts
@@ -1568,11 +1568,16 @@ async function executeProviderApiTest(
           errorDetail = undefined;
         }
 
+        // 使用 errorDetail 或 errorText 的前 200 字符作为错误详情
+        // 添加防御性检查,避免空字符串产生误导性错误消息
+        const finalErrorDetail =
+          errorDetail ?? (errorText ? clipText(errorText, 200) : "No error details available");
+
         logger.error("Provider API test failed", {
           providerUrl: normalizedProviderUrl.replace(/:\/\/[^@]*@/, "://***@"),
           path: typeof options.path === "string" ? options.path : "dynamic",
           status: response.status,
-          errorDetail: errorDetail ?? clipText(errorText, 200),
+          errorDetail: finalErrorDetail,
         });
 
         return {
@@ -1582,7 +1587,7 @@ async function executeProviderApiTest(
             message: `API 返回错误: HTTP ${response.status}`,
             details: {
               responseTime,
-              error: "API 请求失败，查看日志以获得更多信息",
+              error: finalErrorDetail,
             },
           },
         };
diff --git a/src/app/[locale]/settings/providers/_components/forms/api-test-button.tsx b/src/app/[locale]/settings/providers/_components/forms/api-test-button.tsx
index cf763183a..65558e050 100644
--- a/src/app/[locale]/settings/providers/_components/forms/api-test-button.tsx
+++ b/src/app/[locale]/settings/providers/_components/forms/api-test-button.tsx
@@ -527,17 +527,28 @@ export function ApiTestButton({
                   </div>
                 )}
 
-                {/* 复制按钮 */}
-                <Button
-                  type="button"
-                  variant="outline"
-                  size="sm"
-                  onClick={handleCopyResult}
-                  className="w-full"
-                >
-                  <Copy className="h-4 w-4 mr-2" />
-                  {t("copyResult")}
-                </Button>
+                {/* 操作按钮 */}
+                <div className="flex gap-2">
+                  <Button
+                    type="button"
+                    variant="outline"
+                    size="sm"
+                    onClick={handleCopyResult}
+                    className="flex-1"
+                  >
+                    <Copy className="h-4 w-4 mr-2" />
+                    {t("copyResult")}
+                  </Button>
+                  <Button
+                    type="button"
+                    variant="secondary"
+                    size="sm"
+                    onClick={() => setIsDetailDialogOpen(false)}
+                    className="flex-1"
+                  >
+                    {t("close")}
+                  </Button>
+                </div>
               </div>
             </DialogContent>
           </Dialog>
diff --git a/src/instrumentation.ts b/src/instrumentation.ts
index 7e4613df7..eab93c87f 100644
--- a/src/instrumentation.ts
+++ b/src/instrumentation.ts
@@ -5,6 +5,24 @@
 
 import { logger } from "@/lib/logger";
 
+/**
+ * 初始化错误规则检测器
+ * 提取为独立函数以避免代码重复
+ *
+ * 注意: 此函数会传播关键错误,调用者应决定是否需要优雅降级
+ */
+async function initializeErrorRuleDetector(): Promise<void> {
+  // 初始化默认错误规则 - 让关键错误传播
+  const { initializeDefaultErrorRules } = await import("@/repository/error-rules");
+  await initializeDefaultErrorRules();
+  logger.info("Default error rules initialized successfully");
+
+  // 加载错误规则缓存 - 让关键错误传播
+  const { errorRuleDetector } = await import("@/lib/error-rule-detector");
+  await errorRuleDetector.reload();
+  logger.info("Error rule detector cache loaded successfully");
+}
+
 export async function register() {
   // 仅在服务器端执行
   if (process.env.NEXT_RUNTIME === "nodejs") {
@@ -36,13 +54,15 @@ export async function register() {
       const { ensurePriceTable } = await import("@/lib/price-sync/seed-initializer");
       await ensurePriceTable();
 
-      // 初始化默认错误规则
-      const { initializeDefaultErrorRules } = await import("@/repository/error-rules");
+      // 初始化错误规则检测器（非关键功能,允许优雅降级）
       try {
-        await initializeDefaultErrorRules();
-        logger.info("Default error rules initialized successfully");
+        await initializeErrorRuleDetector();
       } catch (error) {
-        logger.error("Failed to initialize default error rules:", error);
+        logger.error(
+          "[Instrumentation] Non-critical: Error rule detector initialization failed",
+          error
+        );
+        // 继续启动 - 错误检测不是核心功能的关键依赖
       }
 
       // 初始化日志清理任务队列（如果启用）
@@ -72,13 +92,15 @@ export async function register() {
       const { ensurePriceTable } = await import("@/lib/price-sync/seed-initializer");
       await ensurePriceTable();
 
-      // 初始化默认错误规则
-      const { initializeDefaultErrorRules } = await import("@/repository/error-rules");
+      // 初始化错误规则检测器（非关键功能,允许优雅降级）
       try {
-        await initializeDefaultErrorRules();
-        logger.info("Default error rules initialized successfully");
+        await initializeErrorRuleDetector();
       } catch (error) {
-        logger.error("Failed to initialize default error rules:", error);
+        logger.error(
+          "[Instrumentation] Non-critical: Error rule detector initialization failed",
+          error
+        );
+        // 继续启动 - 错误检测不是核心功能的关键依赖
       }
 
       // ⚠️ 开发环境禁用通知队列（Bull + Turbopack 不兼容）
diff --git a/src/lib/error-rule-detector.ts b/src/lib/error-rule-detector.ts
index a5b1ec870..d16d49176 100644
--- a/src/lib/error-rule-detector.ts
+++ b/src/lib/error-rule-detector.ts
@@ -61,13 +61,9 @@ class ErrorRuleDetector {
   private exactPatterns: Map<string, ExactPattern> = new Map();
   private lastReloadTime: number = 0;
   private isLoading: boolean = false;
+  private isInitialized: boolean = false; // 跟踪初始化状态
 
   constructor() {
-    // 初始化时立即加载缓存（异步，不阻塞构造函数）
-    this.reload().catch((error) => {
-      logger.error("[ErrorRuleDetector] Failed to initialize cache:", error);
-    });
-
     // 监听数据库变更事件，自动刷新缓存
     eventEmitter.on("errorRulesUpdated", () => {
       this.reload().catch((error) => {
@@ -76,6 +72,17 @@ class ErrorRuleDetector {
     });
   }
 
+  /**
+   * 确保规则已加载（懒加载，首次使用时或显式 reload 时调用）
+   * 避免在数据库未准备好时过早加载
+   */
+  private async ensureInitialized(): Promise<void> {
+    if (this.isInitialized || this.isLoading) {
+      return;
+    }
+    await this.reload();
+  }
+
   /**
    * 从数据库重新加载错误规则
    */
@@ -169,6 +176,7 @@ class ErrorRuleDetector {
       }
 
       this.lastReloadTime = Date.now();
+      this.isInitialized = true; // 标记为已初始化
 
       logger.info(
         `[ErrorRuleDetector] Loaded ${rules.length} error rules: ` +
@@ -184,7 +192,22 @@ class ErrorRuleDetector {
   }
 
   /**
-   * 检测错误消息是否匹配任何规则
+   * 异步检测错误消息（推荐使用）
+   * 确保规则已加载后再进行检测
+   *
+   * @param errorMessage - 错误消息
+   * @returns 检测结果
+   */
+  async detectAsync(errorMessage: string): Promise<ErrorDetectionResult> {
+    await this.ensureInitialized();
+    return this.detect(errorMessage);
+  }
+
+  /**
+   * 检测错误消息是否匹配任何规则（同步版本）
+   *
+   * 注意：如果规则未初始化，会记录警告并返回 false
+   * 推荐使用 detectAsync() 以确保规则已加载
    *
    * 检测顺序（性能优先）：
    * 1. 包含匹配（最快，O(n*m)）
@@ -199,6 +222,13 @@ class ErrorRuleDetector {
       return { matched: false };
     }
 
+    // 如果未初始化，记录警告
+    if (!this.isInitialized && !this.isLoading) {
+      logger.warn(
+        "[ErrorRuleDetector] detect() called before initialization, results may be incomplete. Consider using detectAsync() instead."
+      );
+    }
+
     const lowerMessage = errorMessage.toLowerCase();
     const trimmedMessage = lowerMessage.trim();