feat: 集成 AI 对话与只读查询工具

apps/server/src/ai-chat/ai-chat.migration.spec.ts

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+import { DataSource } from 'typeorm';
+import { AddAiChat1784780000000 } from '../migrations/1784780000000-AddAiChat';
+
+describe('AddAiChat1784780000000', () => {
+  let dataSource: DataSource;
+
+  beforeEach(async () => {
+    dataSource = new DataSource({
+      type: 'better-sqlite3',
+      database: ':memory:',
+      migrations: [AddAiChat1784780000000],
+    });
+    await dataSource.initialize();
+    await dataSource.query(
+      'CREATE TABLE users (id integer PRIMARY KEY AUTOINCREMENT, username varchar(100) NOT NULL)',
+    );
+  });
+
+  afterEach(async () => {
+    if (dataSource.isInitialized) await dataSource.destroy();
+  });
+
+  it('创建会话、消息和工具记录表，并按会话级联删除', async () => {
+    await dataSource.runMigrations();
+
+    for (const table of ['ai_conversations', 'ai_messages', 'ai_tool_runs']) {
+      expect(await dataSource.createQueryRunner().hasTable(table)).toBe(true);
+    }
+
+    await dataSource.query("INSERT INTO users (username) VALUES ('tester')");
+    await dataSource.query(
+      "INSERT INTO ai_conversations (user_id, title) VALUES (1, '测试会话')",
+    );
+    await dataSource.query(
+      "INSERT INTO ai_messages (conversation_id, role, content) VALUES (1, 'assistant', '回答')",
+    );
+    await dataSource.query(
+      "INSERT INTO ai_tool_runs (message_id, tool_call_id, tool_name, status) VALUES (1, 'call_1', 'search_students', 'success')",
+    );
+
+    await dataSource.query('DELETE FROM ai_conversations WHERE id = 1');
+
+    expect(await dataSource.query('SELECT id FROM ai_messages')).toEqual([]);
+    expect(await dataSource.query('SELECT id FROM ai_tool_runs')).toEqual([]);
+  });
+});