重构：模块化 RRPP Lite 并更新入口

lite/rrpp_core/settings_store.py

@@ -0,0 +1,34 @@
+"""用户设置的 JSON 存储实现。"""
+
+import json
+import os
+
+
+class JsonSettingsStore:
+    """读取与原子写回一个 JSON 对象。
+
+    ``path_getter`` 在每次操作时调用，保证测试或运行时切换用户目录后不会
+    意外写到旧目录。
+    """
+
+    def __init__(self, path_getter):
+        self._path_getter = path_getter
+
+    def load(self):
+        path = self._path_getter()
+        try:
+            if not path.is_file():
+                return {}
+            data = json.loads(path.read_text("utf-8"))
+            return data if isinstance(data, dict) else {}
+        except Exception:
+            return {}
+
+    def save(self, data):
+        path = self._path_getter()
+        path.parent.mkdir(parents=True, exist_ok=True)
+        temporary_path = path.with_suffix(path.suffix + ".tmp")
+        temporary_path.write_text(
+            json.dumps(data, ensure_ascii=False, indent=2) + "\n", "utf-8"
+        )
+        os.replace(temporary_path, path)