fix: handle null query params in API + add testing guide

docs/api-testing-guide.md

@@ -0,0 +1,161 @@
+# API 测试指南
+
+## GET /api/events
+
+获取所有事件:
+
+```bash
+curl http://localhost:3000/api/events
+```
+
+筛选特定年份:
+
+```bash
+curl "http://localhost:3000/api/events?year=2024"
+```
+
+限制返回数量:
+
+```bash
+curl "http://localhost:3000/api/events?limit=10"
+```
+
+分页:
+
+```bash
+curl "http://localhost:3000/api/events?offset=10&limit=10"
+```
+
+## POST /api/events
+
+创建单个事件:
+
+```bash
+curl -X POST http://localhost:3000/api/events \
+  -H "Content-Type: application/json" \
+  -H "X-API-Key: YOUR_API_KEY" \
+  -d '[
+    {
+      "title": "事件标题",
+      "eventDate": "2023-03-14T00:00:00Z",
+      "description": "事件描述(10-500字)",
+      "imageUrl": "https://example.com/image.jpg"
+    }
+  ]'
+```
+
+批量创建事件:
+
+```bash
+curl -X POST http://localhost:3000/api/events \
+  -H "Content-Type: application/json" \
+  -H "X-API-Key: YOUR_API_KEY" \
+  -d '[
+    { "title": "事件1", "eventDate": "2023-01-01T00:00:00Z", "description": "描述1", "imageUrl": "https://example.com/1.jpg" },
+    { "title": "事件2", "eventDate": "2023-02-01T00:00:00Z", "description": "描述2", "imageUrl": "https://example.com/2.jpg" }
+  ]'
+```
+
+包含可选字段:
+
+```bash
+curl -X POST http://localhost:3000/api/events \
+  -H "Content-Type: application/json" \
+  -H "X-API-Key: YOUR_API_KEY" \
+  -d '[
+    {
+      "title": "GPT-4 Release",
+      "titleEn": "GPT-4 发布",
+      "eventDate": "2023-03-14T00:00:00Z",
+      "description": "OpenAI launches multimodal LLM",
+      "descriptionEn": "OpenAI 发布多模态大语言模型",
+      "imageUrl": "https://example.com/gpt4.jpg",
+      "sourceUrl": "https://openai.com/blog/gpt-4"
+    }
+  ]'
+```
+
+## 验证规则
+
+### 输入验证 (AIEventInputSchema)
+
+- `title`: 1-200 字符（必填）
+- `titleEn`: 最多 200 字符（可选）
+- `eventDate`: ISO 8601 datetime 格式（必填）
+- `description`: 10-500 字符（必填）
+- `descriptionEn`: 最多 500 字符（可选）
+- `imageUrl`: 有效 URL（必填）
+- `sourceUrl`: 有效 URL（可选）
+
+### 查询参数验证 (AIEventQuerySchema)
+
+- `year`: 4位数字年份（可选）
+- `limit`: 正整数（可选，默认 100）
+- `offset`: 非负整数（可选，默认 0）
+
+## 认证
+
+所有 POST 请求必须在请求头中包含 API Key:
+
+```
+X-API-Key: YOUR_API_KEY
+```
+
+## 响应示例
+
+### 成功响应 (POST)
+
+```json
+{
+  "created": 2,
+  "total": 2
+}
+```
+
+### 成功响应 (GET)
+
+```json
+{
+  "events": [
+    {
+      "id": "cmkwn6q0300004jjz4lobtkpf",
+      "title": "Transformer论文",
+      "titleEn": null,
+      "eventDate": "2017-06-12T00:00:00.000Z",
+      "description": "Google团队发表Transformer架构",
+      "descriptionEn": null,
+      "imageUrl": "https://images.unsplash.com/photo-1677442136019-21780ecad995?w=800",
+      "sourceUrl": null,
+      "createdAt": "2026-01-27T13:38:39.268Z",
+      "updatedAt": "2026-01-27T13:38:39.268Z"
+    }
+  ]
+}
+```
+
+### 错误响应
+
+```json
+{
+  "error": "Validation failed",
+  "details": [
+    {
+      "code": "too_small",
+      "path": ["0", "description"],
+      "message": "String must contain at least 10 character(s)"
+    }
+  ]
+}
+```
+
+## 测试记录
+
+### 2025-01-27 测试结果
+
+- ✅ GET /api/events - 返回空列表
+- ✅ POST /api/events - 单个事件创建成功
+- ✅ GET /api/events - 验证事件已创建（1个事件）
+- ✅ POST /api/events - 批量创建成功（2个事件）
+- ✅ GET /api/events?year=2018 - 年份筛选成功（返回2个事件）
+
+所有基础功能测试通过！

src/app/api/events/route.ts

@@ -65,12 +65,12 @@ export async function POST(request: NextRequest) {
 }
 
 export async function GET(request: NextRequest) {
-  // 1. 解析查询参数
+  // 1. 解析查询参数（将 null 转换为 undefined）
   const searchParams = request.nextUrl.searchParams;
   const queryParams = {
-    year: searchParams.get('year'),
-    limit: searchParams.get('limit'),
-    offset: searchParams.get('offset'),
+    year: searchParams.get('year') || undefined,
+    limit: searchParams.get('limit') || undefined,
+    offset: searchParams.get('offset') || undefined,
   };
 
   // 2. 验证查询参数