refine(usage): enhance query robustness and error handling

Backend improvements:
- Add InvalidHttpMethod error enum for better error semantics
- Clamp HTTP timeout to 2-30s to prevent config abuse
- Strict HTTP method validation instead of silent fallback to GET

Frontend improvements:
- Add i18n support for usage query errors (en/zh)
- Improve error handling with type-safe unknown instead of any
- Optimize i18n import (direct import instead of dynamic)
- Disable auto-retry for usage queries to avoid API stampede

Additional changes:
- Apply prettier formatting to affected files

Files changed:
- src-tauri/src/error.rs (+2)
- src-tauri/src/usage_script.rs (+8 -2)
- src/i18n/locales/{en,zh}.json (+4 -1 each)
- src/lib/api/usage.ts (+21 -4)
- src/lib/query/queries.ts (+1)
- style: prettier formatting on 6 other files

src/lib/api/usage.ts

@@ -1,12 +1,29 @@
 import { invoke } from "@tauri-apps/api/core";
 import type { UsageResult } from "@/types";
 import type { AppId } from "./types";
+import i18n from "@/i18n";
 
 export const usageApi = {
   async query(providerId: string, appId: AppId): Promise<UsageResult> {
-    return await invoke("query_provider_usage", {
-      provider_id: providerId,
-      app: appId,
-    });
+    try {
+      return await invoke("query_provider_usage", {
+        provider_id: providerId,
+        app: appId,
+      });
+    } catch (error: unknown) {
+      // 提取错误消息：优先使用后端返回的错误信息
+      const message =
+        typeof error === "string"
+          ? error
+          : error instanceof Error
+            ? error.message
+            : "";
+
+      // 如果没有错误消息，使用国际化的默认提示
+      return {
+        success: false,
+        error: message || i18n.t("errors.usage_query_failed"),
+      };
+    }
   },
 };