feat: refresh material names in background every two days

shared/runtime/material_name_cache.py

@@ -39,9 +39,19 @@ def material_names_from_records(records: list[dict[str, Any]]) -> dict[str, str]
     return dict(sorted(materials.items()))
 
 
-@lru_cache(maxsize=4)
 def load_material_names(path: Path = MATERIAL_NAME_CACHE_FILE) -> dict[str, str]:
-    """Load once per process; a Git update takes effect after the bot restarts."""
+    """Reuse memory until the local file changes; never access ERP."""
+    try:
+        stat = path.stat()
+    except FileNotFoundError as exc:
+        raise MaterialNameCacheError("本地物料名称缓存文件缺失") from exc
+    except OSError as exc:
+        raise MaterialNameCacheError("本地物料名称缓存文件不可读取") from exc
+    return _load_material_names(path, (stat.st_mtime_ns, stat.st_size, stat.st_ino))
+
+
+@lru_cache(maxsize=4)
+def _load_material_names(path: Path, version: tuple[int, int, int]) -> dict[str, str]:
     try:
         payload = json.loads(path.read_text(encoding="utf-8"))
     except FileNotFoundError as exc:
@@ -62,3 +72,6 @@ def load_material_names(path: Path = MATERIAL_NAME_CACHE_FILE) -> dict[str, str]
     if payload.get("material_count") != len(materials) or payload.get("content_sha256") != material_names_hash(materials):
         raise MaterialNameCacheError("本地物料名称缓存计数或完整性校验失败")
     return materials
+
+
+load_material_names.cache_clear = _load_material_names.cache_clear