feat: auto-update pouch and catalog sources during normal use

Add taste-skill to catalog.yaml, and refresh pouch plus cloned catalog
or custom Git sources on a 24h interval so users do not need a
separate update command.

pouch/sources.py

@@ -6,7 +6,7 @@ import subprocess
 from pathlib import Path
 from typing import Any
 
-from pouch import yaml_io
+from pouch.config import load_user_config, save_user_config
 from pouch.paths import CONFIG_FILE, SOURCES_DIR
 
 RESERVED_SOURCES = {"builtin", "catalog", "owned", "registry"}
@@ -21,27 +21,20 @@ def validate_source_name(name: str) -> None:
 
 
 def load_sources(path: Path | None = None) -> dict[str, dict[str, Any]]:
-    path = path or CONFIG_FILE
-    if not path.is_file():
-        return {}
-    data = yaml_io.safe_load(path.read_text(encoding="utf-8")) or {}
-    if not isinstance(data, dict):
-        raise SystemExit(f"pouch 配置格式错误: {path}")
+    data = load_user_config(path)
     raw = data.get("sources", {})
     if raw is None:
         return {}
     if not isinstance(raw, dict):
-        raise SystemExit(f"pouch 配置 sources 格式错误: {path}")
+        raise SystemExit(f"pouch 配置 sources 格式错误: {path or CONFIG_FILE}")
     return {str(name): entry for name, entry in raw.items() if isinstance(entry, dict)}
 
 
 def save_sources(sources: dict[str, dict[str, Any]], path: Path | None = None) -> None:
     path = path or CONFIG_FILE
-    path.parent.mkdir(parents=True, exist_ok=True)
-    path.write_text(
-        yaml_io.safe_dump({"sources": sources}, allow_unicode=True, sort_keys=False),
-        encoding="utf-8",
-    )
+    data = load_user_config(path)
+    data["sources"] = sources
+    save_user_config(data, path)
 
 
 def source_checkout(name: str, entry: dict[str, Any]) -> Path: