feat: add user role system and public joke submission API

- Add AdminUser role field (admin/submitter)
- User management in admin panel
- Public joke submission API (no auth required)
- Document submission methods for external workers

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/数据提交接口文档.md

@@ -0,0 +1,203 @@
+# 笑话提交接口文档
+
+## 接口地址
+
+```
+基础地址：http://39.104.58.51
+```
+
+---
+
+## 提交笑话
+
+### 接口 1：单条提交
+
+```
+POST /api/jokes/submit
+Content-Type: application/json
+```
+
+**请求示例：**
+
+```bash
+curl -X POST http://39.104.58.51/api/jokes/submit \
+  -H "Content-Type: application/json" \
+  -d '{"title":"笑话标题","content":"笑话内容..."}'
+```
+
+**响应示例：**
+```json
+{"success":true,"id":1280,"message":"已提交，ID: 1280"}
+```
+
+---
+
+### 接口 2：批量提交
+
+```
+POST /api/jokes/submit/batch
+Content-Type: application/json
+```
+
+**请求示例：**
+
+```bash
+curl -X POST http://39.104.58.51/api/jokes/submit/batch \
+  -H "Content-Type: application/json" \
+  -d '{
+    "jokes": [
+      {"title":"标题1","content":"内容1"},
+      {"title":"标题2","content":"内容2"},
+      {"title":"标题3","content":"内容3"}
+    ]
+  }'
+```
+
+**响应示例：**
+```json
+{"success":true,"count":3,"message":"已提交 3 条笑话"}
+```
+
+---
+
+## 编程语言示例
+
+### Python
+
+```python
+import requests
+
+BASE_URL = "http://39.104.58.51"
+
+# 单条提交
+def submit_joke(title, content):
+    resp = requests.post(f"{BASE_URL}/api/jokes/submit", json={
+        "title": title,
+        "content": content
+    })
+    return resp.json()
+
+# 批量提交
+def submit_jokes_batch(jokes):
+    resp = requests.post(f"{BASE_URL}/api/jokes/submit/batch", json={
+        "jokes": jokes  # jokes 是 [{"title":..., "content":...}, ...]
+    })
+    return resp.json()
+
+
+# 使用示例
+if __name__ == "__main__":
+    # 单条
+    result = submit_joke("标题", "内容")
+
+    # 批量
+    jokes = [
+        {"title": "笑话1", "content": "内容1"},
+        {"title": "笑话2", "content": "内容2"},
+        {"title": "笑话3", "content": "内容3"},
+    ]
+    result = submit_jokes_batch(jokes)
+    print(result)
+```
+
+---
+
+### JavaScript / Node.js
+
+```javascript
+const BASE_URL = "http://39.104.58.51";
+
+// 单条提交
+async function submitJoke(title, content) {
+    const resp = await fetch(`${BASE_URL}/api/jokes/submit`, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ title, content })
+    });
+    return resp.json();
+}
+
+// 批量提交
+async function submitJokesBatch(jokes) {
+    const resp = await fetch(`${BASE_URL}/api/jokes/submit/batch`, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ jokes })
+    });
+    return resp.json();
+}
+
+// 使用示例
+(async () => {
+    // 单条
+    console.log(await submitJoke("标题", "内容"));
+
+    // 批量
+    const jokes = [
+        { title: "笑话1", content: "内容1" },
+        { title: "笑话2", content: "内容2" },
+    ];
+    console.log(await submitJokesBatch(jokes));
+})();
+```
+
+---
+
+### Java
+
+```java
+import java.net.http.*;
+import java.net.URI;
+import java.nio.file.*;
+import java.util.*;
+
+public class JokeSubmit {
+    static final String BASE_URL = "http://39.104.58.51";
+
+    public static String post(String path, String body) throws Exception {
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+            .uri(URI.create(BASE_URL + path))
+            .header("Content-Type", "application/json")
+            .POST(HttpRequest.BodyPublishers.ofString(body))
+            .build();
+        return client.send(request, HttpResponse.BodyHandlers.ofString()).body();
+    }
+
+    public static void main(String[] args) throws Exception {
+        // 单条提交
+        System.out.println(post("/api/jokes/submit",
+            "{\"title\":\"标题\",\"content\":\"内容\"}"));
+
+        // 批量提交
+        String batch = """
+            {"jokes":[
+                {"title":"笑话1","content":"内容1"},
+                {"title":"笑话2","content":"内容2"}
+            ]}""";
+        System.out.println(post("/api/jokes/submit/batch", batch));
+    }
+}
+```
+
+---
+
+## 注意事项
+
+1. **无需登录**：此接口公开，无需认证即可提交
+2. **自动审核**：提交后笑话进入「待审核」状态
+3. **字段说明**：
+   - `title`：笑话标题（必填）
+   - `content`：笑话正文（必填）
+4. **批量限制**：建议单次不超过 100 条
+5. **编码**：确保使用 UTF-8 编码
+
+---
+
+## 状态码
+
+| 状态码 | 说明 |
+|--------|------|
+| 200 | 提交成功 |
+| 400 | 请求格式错误 |
+| 500 | 服务器内部错误 |