feat: 将项目从nano重命名为beaver并更新相关配置

- 将所有环境变量前缀从NANO_改为BEAVER_
- 更新README.md文档内容，包括项目介绍、组件说明和快速开始指南
- 修改.gitignore文件，添加auth-portal运行时路径排除规则
- 更新app-instance镜像标签从nano/app-instance改为beaver/app-instance
- 增强技能安全检查器，支持工具前缀白名单功能
- 添加技能草稿重新检查安全性API端点
- 扩展证据选择器，收集工具调用名称用于技能学习
- 改进技能合成器，基于实际调用的工具生成工具提示
- 优化路由超时处理机制，增加重试逻辑
- 更新后端架构文档，添加可视化入口和基础概念说明
- 实现在WebSocket消息中传递工具迭代次数信息

app-instance/backend/beaver/interfaces/web/app.py

@@ -1437,6 +1437,15 @@ def create_app(
             raise HTTPException(status_code=404, detail="Safety report not found")
         return report.to_dict()
 
+    @app.post("/api/skills/{skill_name}/drafts/{draft_id}/safety")
+    async def recheck_skill_draft_safety(skill_name: str, draft_id: str, request: Request) -> dict[str, Any]:
+        loaded = get_agent_service(request).create_loop().boot()
+        try:
+            report = loaded.skill_learning_pipeline.check_safety(skill_name, draft_id)  # type: ignore[union-attr]
+        except ValueError as exc:
+            raise _skill_draft_http_error(exc) from exc
+        return report.to_dict()
+
     @app.get("/api/skills/{skill_name}/drafts/{draft_id}/eval")
     async def get_skill_draft_eval(skill_name: str, draft_id: str, request: Request) -> dict[str, Any]:
         loaded = get_agent_service(request).create_loop().boot()
@@ -1831,6 +1840,7 @@ def create_app(
                         "model": _clean_text(payload.get("model")) or None,
                         "provider_name": _clean_text(payload.get("provider_name")) or None,
                         "embedding_model": _clean_text(payload.get("embedding_model")) or None,
+                        "max_tool_iterations": _int_or_none(payload.get("max_tool_iterations")),
                     }
                     websocket_thinking_enabled = _bool_or_none(payload.get("thinking_enabled"))
                     if websocket_thinking_enabled is not None:
@@ -1844,6 +1854,7 @@ def create_app(
                         "content": f"Run failed before completion: {exc}",
                         "session_id": session_id,
                         "finish_reason": "error",
+                        "tool_iterations": 0,
                         "metadata": {
                             "error": str(exc),
                             "input_metadata": _websocket_input_metadata(payload),
@@ -2403,6 +2414,15 @@ def _bool_or_none(value: Any) -> bool | None:
     return None
 
 
+def _int_or_none(value: Any) -> int | None:
+    if value in (None, ""):
+        return None
+    try:
+        return int(value)
+    except (TypeError, ValueError):
+        return None
+
+
 def _websocket_message_payload(result: Any, *, input_payload: dict[str, Any]) -> dict[str, Any]:
     validation_result = getattr(result, "validation_result", None)
     task_id = getattr(result, "task_id", None)
@@ -2414,6 +2434,7 @@ def _websocket_message_payload(result: Any, *, input_payload: dict[str, Any]) ->
         "session_id": getattr(result, "session_id", None),
         "run_id": getattr(result, "run_id", None),
         "finish_reason": getattr(result, "finish_reason", None),
+        "tool_iterations": getattr(result, "tool_iterations", 0),
         "provider_name": getattr(result, "provider_name", None),
         "model": getattr(result, "model", None),
         "usage": dict(getattr(result, "usage", {}) or {}),