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-tauri/src/error.rs

@@ -46,6 +46,8 @@ pub enum AppError {
     McpValidation(String),
     #[error("{0}")]
     Message(String),
+    #[error("不支持的 HTTP 方法: {0}")]
+    InvalidHttpMethod(String),
     #[error("{zh} ({en})")]
     Localized {
         key: &'static str,

src-tauri/src/usage_script.rs

@@ -116,12 +116,18 @@ struct RequestConfig {
 
 /// 发送 HTTP 请求
 async fn send_http_request(config: &RequestConfig, timeout_secs: u64) -> Result<String, AppError> {
+    // 约束超时范围，防止异常配置导致长时间阻塞
+    let timeout = timeout_secs.clamp(2, 30);
     let client = Client::builder()
-        .timeout(Duration::from_secs(timeout_secs))
+        .timeout(Duration::from_secs(timeout))
         .build()
         .map_err(|e| AppError::Message(format!("创建客户端失败: {}", e)))?;
 
-    let method = config.method.parse().unwrap_or(reqwest::Method::GET);
+    // 严格校验 HTTP 方法，非法值不回退为 GET
+    let method: reqwest::Method = config
+        .method
+        .parse()
+        .map_err(|_| AppError::InvalidHttpMethod(config.method.clone()))?;
 
     let mut req = client.request(method.clone(), &config.url);