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/service.py

@@ -99,6 +99,7 @@ class SkillLearningService:
         ]
         source_run_ids = [record.run_id for record in source_runs]
         source_session_ids = list(dict.fromkeys(record.session_id for record in source_runs))
+        representative_task_text = self._representative_task_text(source_runs, fallback=final_run.task_text)
 
         if not published_receipts:
             candidates.append(
@@ -113,7 +114,8 @@ class SkillLearningService:
                         "task_id": task_id,
                         "final_accepted_run_id": final_accepted_run_id,
                         "source_run_ids": source_run_ids,
-                        "theme": self._task_theme(final_run.task_text),
+                        "task_text": representative_task_text,
+                        "theme": self._task_theme(representative_task_text),
                     },
                     status="open",
                     priority=1,
@@ -329,8 +331,14 @@ class SkillLearningService:
 
     def _build_new_skill_candidates(self) -> list[SkillLearningCandidate]:
         groups: dict[str, list[RunRecord]] = {}
-        for record in self.run_store.list_runs():
-            key = self._task_theme(record.task_text)
+        all_runs = self.run_store.list_runs()
+        runs_by_task: dict[str, list[RunRecord]] = {}
+        for record in all_runs:
+            if record.task_id:
+                runs_by_task.setdefault(record.task_id, []).append(record)
+        for record in all_runs:
+            task_runs = runs_by_task.get(record.task_id, [record])
+            key = self._task_theme(self._representative_task_text(task_runs, fallback=record.task_text))
             if not key:
                 continue
             groups.setdefault(key, []).append(record)
@@ -443,12 +451,24 @@ class SkillLearningService:
 
     @staticmethod
     def _task_theme(task_text: str) -> str:
-        cleaned = re.sub(r"\s+", " ", task_text.strip().lower())
+        cleaned = re.sub(r"\s+", " ", task_text.strip())
         if not cleaned:
             return ""
-        words = cleaned.split(" ")
+        first_sentence = re.split(r"[。！？.!?]", cleaned, maxsplit=1)[0].strip()
+        if not first_sentence:
+            first_sentence = cleaned
+        words = first_sentence.split(" ")
         return " ".join(words[:8]).strip()
 
+    @staticmethod
+    def _representative_task_text(runs: list[RunRecord], *, fallback: str = "") -> str:
+        ordered = sorted(runs, key=lambda item: (item.attempt_index, item.started_at, item.run_id))
+        for record in ordered:
+            text = record.task_text.strip()
+            if text:
+                return text
+        return fallback.strip()
+
     @staticmethod
     def _suggest_skill_name(
         candidate: SkillLearningCandidate,