chore: unify code formatting and remove unused code

- Apply cargo fmt to Rust code with multiline error handling
- Apply Prettier formatting to TypeScript code with trailing commas
- Unify #[allow(non_snake_case)] attribute formatting
- Remove unused ProviderNotFound error variant from error.rs
- Add vitest-report.json to .gitignore to exclude test artifacts
- Optimize readability of error handling chains with vertical alignment

All tests passing: 22 Rust tests + 126 frontend tests

src/components/UsageFooter.tsx

@@ -333,7 +333,7 @@ const UsagePlanItem: React.FC<{ data: UsageData }> = ({ data }) => {
 function formatRelativeTime(
   timestamp: number,
   now: number,
-  t: (key: string, options?: { count?: number }) => string
+  t: (key: string, options?: { count?: number }) => string,
 ): string {
   const diff = Math.floor((now - timestamp) / 1000); // 秒
 

src/components/UsageScriptModal.tsx

@@ -33,7 +33,9 @@ const TEMPLATE_KEYS = {
 } as const;
 
 // 生成预设模板的函数（支持国际化）
-const generatePresetTemplates = (t: (key: string) => string): Record<string, string> => ({
+const generatePresetTemplates = (
+  t: (key: string) => string,
+): Record<string, string> => ({
   [TEMPLATE_KEYS.CUSTOM]: `({
   request: {
     url: "",
@@ -135,7 +137,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
         return TEMPLATE_KEYS.NEW_API;
       }
       return null;
-    }
+    },
   );
 
   const handleSave = () => {
@@ -165,7 +167,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
         script.code,
         script.timeout,
         script.accessToken,
-        script.userId
+        script.userId,
       );
       if (result.success && result.data && result.data.length > 0) {
         // 显示所有套餐数据
@@ -183,7 +185,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
           `${t("usageScript.testFailed")}: ${result.error || t("endpointTest.noResult")}`,
           {
             duration: 5000,
-          }
+          },
         );
       }
     } catch (error: any) {
@@ -191,7 +193,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
         `${t("usageScript.testFailed")}: ${error?.message || t("common.unknown")}`,
         {
           duration: 5000,
-        }
+        },
       );
     } finally {
       setTesting(false);
@@ -215,7 +217,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
         `${t("usageScript.formatFailed")}: ${error?.message || t("jsonEditor.invalidJson")}`,
         {
           duration: 3000,
-        }
+        },
       );
     }
   };

src/components/providers/forms/ProviderForm.tsx

@@ -331,26 +331,34 @@ export function ProviderForm({
     // 处理 meta 字段：基于 draftCustomEndpoints 生成 custom_endpoints
     // 注意：不使用 customEndpointsMap，因为它包含了候选端点（预设、Base URL 等）
     // 而我们只需要保存用户真正添加的自定义端点
-    const customEndpointsToSave: Record<string, import("@/types").CustomEndpoint> | null =
+    const customEndpointsToSave: Record<
+      string,
+      import("@/types").CustomEndpoint
+    > | null =
       draftCustomEndpoints.length > 0
-        ? draftCustomEndpoints.reduce((acc, url) => {
-            // 尝试从 initialData.meta 中获取原有的端点元数据（保留 addedAt 和 lastUsed）
-            const existing = initialData?.meta?.custom_endpoints?.[url];
-            if (existing) {
-              acc[url] = existing;
-            } else {
-              // 新端点：使用当前时间戳
-              const now = Date.now();
-              acc[url] = { url, addedAt: now, lastUsed: undefined };
-            }
-            return acc;
-          }, {} as Record<string, import("@/types").CustomEndpoint>)
+        ? draftCustomEndpoints.reduce(
+            (acc, url) => {
+              // 尝试从 initialData.meta 中获取原有的端点元数据（保留 addedAt 和 lastUsed）
+              const existing = initialData?.meta?.custom_endpoints?.[url];
+              if (existing) {
+                acc[url] = existing;
+              } else {
+                // 新端点：使用当前时间戳
+                const now = Date.now();
+                acc[url] = { url, addedAt: now, lastUsed: undefined };
+              }
+              return acc;
+            },
+            {} as Record<string, import("@/types").CustomEndpoint>,
+          )
         : null;
 
     // 检测是否需要清空端点（重要：区分"用户清空端点"和"用户没有修改端点"）
-    const hadEndpoints = initialData?.meta?.custom_endpoints &&
-                         Object.keys(initialData.meta.custom_endpoints).length > 0;
-    const needsClearEndpoints = hadEndpoints && draftCustomEndpoints.length === 0;
+    const hadEndpoints =
+      initialData?.meta?.custom_endpoints &&
+      Object.keys(initialData.meta.custom_endpoints).length > 0;
+    const needsClearEndpoints =
+      hadEndpoints && draftCustomEndpoints.length === 0;
 
     // 如果用户明确清空了端点，传递空对象（而不是 null）让后端知道要删除
     const mergedMeta = needsClearEndpoints