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/publisher/service.py

@@ -16,8 +16,8 @@ class SkillPublisher:
 
     def publish(self, skill_name: str, draft_id: str, publisher: str, notes: str = "") -> SkillVersion:
         draft = self._require_draft(skill_name, draft_id)
-        if draft.status != SkillReviewState.APPROVED.value:
-            raise ValueError("Draft must be approved before publish")
+        if draft.status not in {SkillReviewState.IN_REVIEW.value, SkillReviewState.APPROVED.value}:
+            raise ValueError("Draft must be submitted for review before publish")
         if draft.proposal_kind == "retire_skill":
             raise ValueError("Retire proposals must be applied through apply_retire_proposal")
 
@@ -81,8 +81,8 @@ class SkillPublisher:
 
     def apply_retire_proposal(self, skill_name: str, draft_id: str, actor: str, notes: str = "") -> SkillSpec:
         draft = self._require_draft(skill_name, draft_id)
-        if draft.status != SkillReviewState.APPROVED.value:
-            raise ValueError("Retire proposal must be approved before apply")
+        if draft.status not in {SkillReviewState.IN_REVIEW.value, SkillReviewState.APPROVED.value}:
+            raise ValueError("Retire proposal must be submitted for review before apply")
         if draft.proposal_kind != "retire_skill":
             raise ValueError("Only retire_skill proposals can be applied as retire proposals")