添加全局协作规约功能

新功能：
- 新增 global_collaboration_rules 表
- POST /api/rules/global - 设置全局规约
- GET /api/rules/global - 获取全局规约
- 智能体领取任务时同时收到全局规约和项目规约

规约层级：
1. 全局规约 - 适用于所有项目和智能体
2. 项目规约 - 仅适用于特定项目

智能体领取任务时的响应示例：
{
  "collaboration_rules": {
    "global_rules": "全局规约内容",
    "project_rules": "项目规约内容"
  }
}

server-v2.js

@@ -93,7 +93,18 @@ async function initDatabase() {
       )
     `);
 
-    // 协作规约表
+    // 全局协作规约表
+    await client.query(`
+      CREATE TABLE IF NOT EXISTS global_collaboration_rules (
+        id VARCHAR(255) PRIMARY KEY,
+        content TEXT NOT NULL,
+        created_by VARCHAR(255),
+        created_at BIGINT,
+        updated_at BIGINT
+      )
+    `);
+
+    // 项目协作规约表
     await client.query(`
       CREATE TABLE IF NOT EXISTS collaboration_rules (
         id VARCHAR(255) PRIMARY KEY,
@@ -269,7 +280,48 @@ app.put('/api/projects/:id', async (req, res) => {
 
 // ==================== 协作规约 API ====================
 
-// 设置协作规约
+// 设置全局协作规约
+app.post('/api/rules/global', async (req, res) => {
+  const { content, created_by } = req.body;
+  
+  if (!content) {
+    return res.status(400).json({ error: '规约内容不能为空' });
+  }
+
+  const id = uuidv4();
+  const now = Date.now();
+
+  try {
+    // 删除旧的全局规约（只保留一个）
+    await pool.query('DELETE FROM global_collaboration_rules');
+    
+    // 创建新的全局规约
+    await pool.query(
+      `INSERT INTO global_collaboration_rules (id, content, created_by, created_at, updated_at) 
+       VALUES ($1, $2, $3, $4, $5)`,
+      [id, content, created_by || 'human', now, now]
+    );
+    
+    res.json({ 
+      id,
+      message: '全局协作规约设置成功' 
+    });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// 获取全局协作规约
+app.get('/api/rules/global', async (req, res) => {
+  try {
+    const result = await pool.query('SELECT * FROM global_collaboration_rules');
+    res.json(result.rows[0] || null);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+// 设置项目协作规约
 app.post('/api/projects/:projectId/rules', async (req, res) => {
   const { projectId } = req.params;
   const { content, created_by } = req.body;
@@ -598,8 +650,13 @@ app.post('/api/tasks/:id/claim', async (req, res) => {
       return res.status(400).json({ error: '任务状态不允许领取' });
     }
     
-    // 获取项目的协作规约
-    const rulesResult = await client.query(
+    // 获取全局协作规约
+    const globalRulesResult = await client.query(
+      'SELECT content FROM global_collaboration_rules'
+    );
+    
+    // 获取项目协作规约
+    const projectRulesResult = await client.query(
       'SELECT content FROM collaboration_rules WHERE project_id = $1',
       [task.project_id]
     );
@@ -617,10 +674,20 @@ app.post('/api/tasks/:id/claim', async (req, res) => {
       message: '任务领取成功'
     };
     
-    // 如果有协作规约，返回给智能体
-    if (rulesResult.rows.length > 0) {
-      response.collaboration_rules = rulesResult.rows[0].content;
-      response.notice = '⚠️ 请严格遵守项目协作规约';
+    // 返回规约给智能体
+    const rules = {};
+    
+    if (globalRulesResult.rows.length > 0) {
+      rules.global_rules = globalRulesResult.rows[0].content;
+    }
+    
+    if (projectRulesResult.rows.length > 0) {
+      rules.project_rules = projectRulesResult.rows[0].content;
+    }
+    
+    if (rules.global_rules || rules.project_rules) {
+      response.collaboration_rules = rules;
+      response.notice = '⚠️ 请严格遵守协作规约';
     }
     
     res.json(response);