refactor: 重构项目架构，移除YAML编排与旧注册系统

1.  将所有YAML配置的工具迁移到`@px.tool`装饰器实现
2.  拆分`llm`模块为`msdownload`和`sglang`子模块
3.  移除废弃的`registry.py`、`yaml_loader.py`和`yamlrun.py`模块
4.  清理项目依赖，移除PyYAML相关包
5.  更新文档与测试用例适配新架构

tests/cli/test_envdev.py

@@ -1,4 +1,4 @@
-"""Tests for ops.dev 模块 envdev/dockercmd 函数 (镜像源配置/Docker 登录)."""
+"""Tests for ops.envdev / ops.dockercmd 模块 (镜像源配置/Docker 登录)."""
 
 from __future__ import annotations
 
@@ -9,8 +9,8 @@ from unittest.mock import MagicMock
 import pytest
 
 from pyflowx.conditions import Constants
-from pyflowx.ops.dev import (
-    docker_login_tencent,
+from pyflowx.ops.dockercmd import docker_login_tencent
+from pyflowx.ops.envdev import (
     download_rustup_script,
     install_linux_docker,
     install_linux_fonts,
@@ -123,10 +123,10 @@ class TestSetupRustMirror:
 
     def test_creates_sccache_dir(self, monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -> None:
         """应创建 sccache 缓存目录."""
-        from pyflowx.ops import dev as dev_module
+        from pyflowx.ops import envdev as envdev_module
 
         fake_sccache = tmp_path / ".cargo" / "sccache"
-        monkeypatch.setattr(dev_module, "_RUST_SCCACHE_DIR", fake_sccache)
+        monkeypatch.setattr(envdev_module, "_RUST_SCCACHE_DIR", fake_sccache)
         monkeypatch.setattr(Path, "home", lambda: tmp_path)
         setup_rust_mirror("tsinghua")
         assert fake_sccache.exists()