fix: 消除并发测试中的 tool 导出竞争和 SQLite 目录碰撞

tests/server/ai/registry.test.ts

@@ -1,19 +1,8 @@
-import { describe, expect, mock, test } from "bun:test";
+import { describe, expect, test } from "bun:test";
 
 import { createNoopLogger } from "../../../src/server/logger";
 import { createMigratedTestDatabase } from "../../helpers";
-
-void mock.module("ai", () => ({
-  createProviderRegistry: (providers: Record<string, { languageModel: (modelId: string) => unknown }>) => ({
-    languageModel: (id: string) => {
-      const [providerId, modelId] = id.split(":");
-      const provider = providers[providerId ?? ""];
-      if (!provider || !modelId) throw new Error(`No such provider: ${id}`);
-      return provider.languageModel(modelId);
-    },
-  }),
-  generateText: () => Promise.resolve({ text: "Hi" }),
-}));
+import "../mocks/ai";
 
 async function withProviderServer(
   modelsResponse: Response,