refactor: 将共用代码迁入 lib/ 模块化目录

统一 strategy、key_monitor、trade、hub 等共用库到 lib/ 子包，并补充 lib-structure 文档，便于四所与中控维护。

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/paths.py

@@ -0,0 +1,22 @@
+"""Repository path helpers for lib/ assets."""
+from __future__ import annotations
+
+from pathlib import Path
+
+LIB_DIR = Path(__file__).resolve().parent
+REPO_ROOT = LIB_DIR.parent
+
+
+def strategy_templates_dir(repo_root: str | Path | None = None) -> str:
+    root = Path(repo_root) if repo_root is not None else REPO_ROOT
+    return str(root / "lib" / "strategy" / "templates")
+
+
+def embed_templates_dir(repo_root: str | Path | None = None) -> str:
+    root = Path(repo_root) if repo_root is not None else REPO_ROOT
+    return str(root / "lib" / "instance" / "templates")
+
+
+def common_static_dir(repo_root: str | Path | None = None) -> str:
+    root = Path(repo_root) if repo_root is not None else REPO_ROOT
+    return str(root / "lib" / "common" / "static")