feat(frontend): add failover API layer and TanStack Query hooks

Add frontend data layer for failover management:

- Add failover.ts API: Tauri invoke wrappers for all failover commands
- Add failover.ts query hooks: TanStack Query mutations and queries
  - useProxyTargets, useProviderHealth queries
  - useSetProxyTarget, useResetCircuitBreaker mutations
  - useCircuitBreakerConfig query and mutation
- Update queries.ts with provider health query key
- Update mutations.ts to invalidate health on provider changes
- Add CircuitBreakerConfig and ProviderHealth types

src/lib/query/mutations.ts

@@ -36,9 +36,10 @@ export const useAddProviderMutation = (appId: AppId) => {
       toast.success(
         t("notifications.providerAdded", {
           defaultValue: "供应商已添加",
-        }), {
-          closeButton: true
-        }
+        }),
+        {
+          closeButton: true,
+        },
       );
     },
     onError: (error: Error) => {
@@ -66,9 +67,10 @@ export const useUpdateProviderMutation = (appId: AppId) => {
       toast.success(
         t("notifications.updateSuccess", {
           defaultValue: "供应商更新成功",
-        }), {
-          closeButton: true
-        }
+        }),
+        {
+          closeButton: true,
+        },
       );
     },
     onError: (error: Error) => {
@@ -106,9 +108,10 @@ export const useDeleteProviderMutation = (appId: AppId) => {
       toast.success(
         t("notifications.deleteSuccess", {
           defaultValue: "供应商已删除",
-        }), {
-          closeButton: true
-        }
+        }),
+        {
+          closeButton: true,
+        },
       );
     },
     onError: (error: Error) => {
@@ -147,9 +150,10 @@ export const useSwitchProviderMutation = (appId: AppId) => {
         t("notifications.switchSuccess", {
           defaultValue: "切换供应商成功",
           appName: t(`apps.${appId}`, { defaultValue: appId }),
-        }), {
-          closeButton: true
-        }
+        }),
+        {
+          closeButton: true,
+        },
       );
     },
     onError: (error: Error) => {