feat(app): 移除内置agents并添加CORS支持和技能上传优化

移除了agents/registry.json中的所有内置agents配置，将agents数组清空。
为web应用添加了CORS中间件支持，允许指定的前端地址跨域访问。
重构了技能上传功能，增加了LLM重写机制，自动规范化上传的技能格式。
新增了工具名称提取逻辑，从技能正文中自动识别Required Tools段落。
更新了技能学习候选者和草稿的载荷结构，添加评估报告统计信息。
修改了意图路由技能的说明，改进任务状态管理逻辑。

app-instance/backend/beaver/skills/learning/surrogate.py

@@ -15,12 +15,15 @@ class SurrogateToolEvaluator:
         return {
             "baseline_score": baseline_score,
             "candidate_score": candidate_score,
+            "baseline_tool_execution_score": baseline_score,
+            "candidate_tool_execution_score": candidate_score,
             "delta": round(candidate_score - baseline_score, 4),
             "surrogate_tool_count": surrogate_count,
             "blocked_tool_count": blocked_count,
+            "score_role": "diagnostic_only",
             "confidence": confidence,
             "notes": [
-                "Surrogate score is based on intended tool calls, schemas, arguments, and task relevance.",
+                "Tool execution score is diagnostic only and is not the main task ability score.",
             ],
         }