refactor(health): replace model_test with stream_check

Replace model_test module with stream_check across the codebase:
- Remove model_test command and service modules
- Update command registry in lib.rs to use stream_check commands
- Update module exports in commands/mod.rs and services/mod.rs
- Remove frontend useModelTest hook
- Update stream_check command implementation

This refactoring provides clearer naming and better separation of concerns.

src/hooks/useModelTest.ts

@@ -1,66 +0,0 @@
-import { useState, useCallback } from "react";
-import { toast } from "sonner";
-import { useTranslation } from "react-i18next";
-import { testProviderModel, type ModelTestResult } from "@/lib/api/model-test";
-import type { AppId } from "@/lib/api";
-
-export function useModelTest(appId: AppId) {
-  const { t } = useTranslation();
-  const [testingIds, setTestingIds] = useState<Set<string>>(new Set());
-
-  const testProvider = useCallback(
-    async (
-      providerId: string,
-      providerName: string,
-    ): Promise<ModelTestResult | null> => {
-      setTestingIds((prev) => new Set(prev).add(providerId));
-
-      try {
-        const result = await testProviderModel(appId, providerId);
-
-        if (result.success) {
-          toast.success(
-            t("modelTest.success", {
-              name: providerName,
-              time: result.responseTimeMs,
-              defaultValue: `${providerName} 测试成功 (${result.responseTimeMs}ms)`,
-            }),
-          );
-        } else {
-          toast.error(
-            t("modelTest.failed", {
-              name: providerName,
-              error: result.message,
-              defaultValue: `${providerName} 测试失败: ${result.message}`,
-            }),
-          );
-        }
-
-        return result;
-      } catch (e) {
-        toast.error(
-          t("modelTest.error", {
-            name: providerName,
-            error: String(e),
-            defaultValue: `${providerName} 测试出错: ${String(e)}`,
-          }),
-        );
-        return null;
-      } finally {
-        setTestingIds((prev) => {
-          const next = new Set(prev);
-          next.delete(providerId);
-          return next;
-        });
-      }
-    },
-    [appId, t],
-  );
-
-  const isTesting = useCallback(
-    (providerId: string) => testingIds.has(providerId),
-    [testingIds],
-  );
-
-  return { testProvider, isTesting };
-}