重大重构：引擎模块拆分 + P0插件实现 + 55个Bug修复

核心变更:
- engine.py(1781行)拆分为8个独立模块: lifecycle/security/deps/
  datastore/pl_injector/watcher/signature/manager
- 新增plugin-bridge: 事件总线 + 服务注册 + RPC通信
- 新增i18n: 国际化/多语言翻译支持
- 新增plugin-storage: 插件键值/文件存储
- 新增ws-api: WebSocket实时通信(pub/sub + 自定义处理器)
- nodejs-adapter统一为Plugin ABC模式

Bug修复:
- 修复load_all()中store_dir未定义崩溃
- 修复DependencyResolver入度计算(拓扑排序)
- 修复PermissionError隐藏内置异常
- 修复CORS中间件头部未附加到响应
- 修复IntegrityChecker跳过__pycache__目录
- 修复版本号不一致(v2.0.0→v1.2.0)
- 修复测试文件的Logger导入/路径/私有方法调用
- 修复context.py缺少typing导入
- 修复config.py STORE_DIR默认路径(./mods→./store)

测试覆盖: 14→91个测试, 全部通过

oss/tests/test_plugin_storage.py

@@ -0,0 +1,88 @@
+"""Tests for plugin-storage plugin"""
+
+import os
+import sys
+import tempfile
+import json
+import pytest
+from pathlib import Path
+
+PLUGIN_DIR = Path(__file__).parent.parent / "store" / "NebulaShell" / "plugin-storage"
+sys.path.insert(0, str(PLUGIN_DIR))
+
+import importlib.util
+spec = importlib.util.spec_from_file_location("storage_main", str(PLUGIN_DIR / "main.py"))
+main_module = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(main_module)
+PluginStorage = main_module.PluginStorage
+
+
+class TestPluginStorage:
+    @pytest.fixture
+    def storage(self, tmp_path):
+        s = PluginStorage()
+        s._base_dir = tmp_path / "plugin-storage"
+        s._base_dir.mkdir(parents=True, exist_ok=True)
+        return s
+
+    def test_set_and_get(self, storage):
+        storage.set("test-plugin", "name", "hello")
+        assert storage.get("test-plugin", "name") == "hello"
+
+    def test_get_default(self, storage):
+        assert storage.get("test-plugin", "missing", "default") == "default"
+
+    def test_get_nonexistent(self, storage):
+        assert storage.get("test-plugin", "missing") is None
+
+    def test_delete(self, storage):
+        storage.set("test-plugin", "key", "val")
+        assert storage.get("test-plugin", "key") == "val"
+        storage.delete("test-plugin", "key")
+        assert storage.get("test-plugin", "key") is None
+
+    def test_list_keys(self, storage):
+        storage.set("test-plugin", "a", 1)
+        storage.set("test-plugin", "b", 2)
+        keys = storage.list_keys("test-plugin")
+        assert "a" in keys
+        assert "b" in keys
+
+    def test_clear(self, storage):
+        storage.set("test-plugin", "x", 1)
+        storage.clear("test-plugin")
+        assert storage.get("test-plugin", "x") is None
+
+    def test_raw_storage(self, storage):
+        storage.set_raw("test-plugin", "data.bin", b"hello world")
+        assert storage.get_raw("test-plugin", "data.bin") == b"hello world"
+
+    def test_delete_raw(self, storage):
+        storage.set_raw("test-plugin", "tmp.bin", b"123")
+        assert storage.get_raw("test-plugin", "tmp.bin") is not None
+        storage.delete_raw("test-plugin", "tmp.bin")
+        assert storage.get_raw("test-plugin", "tmp.bin") is None
+
+    def test_storage_size(self, storage):
+        storage.set("test-plugin", "a", "hello")
+        size = storage.get_storage_size("test-plugin")
+        assert size > 0
+
+    def test_get_info(self, storage):
+        info = storage.get_info()
+        assert "base_dir" in info
+        assert "plugins" in info
+
+    def test_lifecycle(self, storage):
+        storage.init()
+        storage.start()
+        storage.stop()
+
+    def test_json_types(self, storage):
+        data = {"nested": [1, 2, 3], "flag": True, "val": None}
+        storage.set("test-plugin", "complex", data)
+        assert storage.get("test-plugin", "complex") == data
+
+
+if __name__ == '__main__':
+    pytest.main([__file__, '-v'])