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/pipeline.py

@@ -323,8 +323,8 @@ class SkillLearningPipelineService:
 
     def _validate_publish_gates(self, draft: SkillDraft, *, confirm_high_risk: bool) -> None:
         reviews = self.reviews_for_draft(draft.skill_name, draft.draft_id)
-        if not any(review.status == SkillReviewState.APPROVED.value for review in reviews):
-            raise ValueError("Draft must have an approved review before publish")
+        if not any(review.status in {SkillReviewState.IN_REVIEW.value, SkillReviewState.APPROVED.value} for review in reviews):
+            raise ValueError("Draft must be submitted for review before publish")
         safety = self.get_safety_report(draft.skill_name, draft.draft_id)
         if safety is None:
             raise ValueError("Draft requires a passing safety report before publish")