refactor: 优化 NBPF 模块 - 缓存导入/合并重复方法/减少I/O

- crypto.py: 8个_imp_*方法改为_ModuleCache类缓存导入
- crypto.py: outer/inner加解密合并为_layer_encrypt/decrypt
- crypto.py: 提取公共摘要计算方法，拆分长方法
- compiler.py: 删除_obfuscate_code中未使用的死代码
- loader.py: 3次ZIP扫描合并为1次缓存读取
- format.py: 更新为使用_ModuleCache
- 合计减少205行代码（1707→1502）

oss/core/datastore.py

@@ -79,14 +79,14 @@ class DataStore:
             Log.error("Core", f"插件 '{plugin_name}' 试图将数据存储到项目目录: {custom_path}")
             return False
         path.mkdir(parents=True, exist_ok=True)
-        # 创建符号链接或记录映射
-        mapping_file = self._base_dir / "_custom_paths.json"
-        mappings = {}
-        if mapping_file.exists():
-            try:
-                mappings = json.loads(mapping_file.read_text())
-            except (json.JSONDecodeError, OSError):
-                pass
-        mappings[plugin_name] = str(path)
-        mapping_file.write_text(json.dumps(mappings, indent=2))
+        with self._lock:
+            mapping_file = self._base_dir / "_custom_paths.json"
+            mappings = {}
+            if mapping_file.exists():
+                try:
+                    mappings = json.loads(mapping_file.read_text())
+                except (json.JSONDecodeError, OSError):
+                    pass  # 映射文件不存在或损坏是正常情况
+            mappings[plugin_name] = str(path)
+            mapping_file.write_text(json.dumps(mappings, indent=2))
         return True