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_bridge.py

@@ -0,0 +1,116 @@
+"""Tests for plugin-bridge: event bus, service registry"""
+
+import os
+import sys
+import pytest
+from pathlib import Path
+
+PLUGIN_DIR = Path(__file__).parent.parent / "store" / "NebulaShell" / "plugin-bridge"
+sys.path.insert(0, str(PLUGIN_DIR))
+
+import importlib.util
+spec = importlib.util.spec_from_file_location("plugin_bridge_main", str(PLUGIN_DIR / "main.py"))
+main_module = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(main_module)
+Bridge = main_module.Bridge
+
+
+class TestEventBus:
+    def test_on_and_emit(self):
+        b = Bridge()
+        results = []
+        b.on("test.event", lambda *a, **kw: results.append((a, kw)))
+        b.emit("test.event", "hello", x=1)
+        assert len(results) == 1
+        assert results[0] == (("hello",), {"x": 1})
+
+    def test_multiple_handlers(self):
+        b = Bridge()
+        r1, r2 = [], []
+        b.on("evt", lambda: r1.append(1))
+        b.on("evt", lambda: r2.append(2))
+        b.emit("evt")
+        assert r1 == [1]
+        assert r2 == [2]
+
+    def test_off(self):
+        b = Bridge()
+        results = []
+        handler = lambda: results.append(1)
+        b.on("evt", handler)
+        b.emit("evt")
+        assert results == [1]
+        b.off("evt", "unknown")
+        b.emit("evt")
+        assert results == [1]
+
+    def test_no_listeners(self):
+        b = Bridge()
+        result = b.emit("nonexistent")
+        assert result == []
+
+    def test_has_listeners(self):
+        b = Bridge()
+        assert not b.has_listeners("evt")
+        b.on("evt", lambda: None)
+        assert b.has_listeners("evt")
+
+    def test_emit_async(self):
+        import time
+        b = Bridge()
+        results = []
+        def slow():
+            time.sleep(0.05)
+            results.append("done")
+        b.on("async", slow)
+        b.emit_async("async")
+        assert len(results) == 0
+        time.sleep(0.1)
+        assert results == ["done"]
+
+    def test_clear(self):
+        b = Bridge()
+        b.on("evt", lambda: None)
+        assert b.has_listeners("evt")
+        b.event_bus.clear()
+        assert not b.has_listeners("evt")
+
+
+class TestServiceRegistry:
+    def test_register_and_get(self):
+        b = Bridge()
+        svc = {"name": "myservice"}
+        b.provide("myservice", svc)
+        assert b.use("myservice") is svc
+
+    def test_has_service(self):
+        b = Bridge()
+        assert not b.has_service("x")
+        b.provide("x", object())
+        assert b.has_service("x")
+
+    def test_list_services(self):
+        b = Bridge()
+        b.provide("a", object())
+        b.provide("b", object())
+        svcs = b.list_services()
+        assert "a" in svcs
+        assert "b" in svcs
+
+    def test_get_info(self):
+        b = Bridge()
+        info = b.get_info()
+        assert "services" in info
+        assert "event_listeners" in info
+
+
+class TestLifecycle:
+    def test_init_start_stop(self):
+        b = Bridge()
+        b.init()
+        b.start()
+        b.stop()
+
+
+if __name__ == '__main__':
+    pytest.main([__file__, '-v'])