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/plugin/manager.py

@@ -31,8 +31,8 @@ class PluginManager:
             try:
                 validator = get_validator()
                 validator.unlock("deep_diver")
-            except Exception:
-                pass
+            except Exception as e:
+                print(f"[PluginManager] 错误: {e}")
 
     def start(self):
         """启动 Core，它会初始化并启动所有其他插件"""
@@ -57,8 +57,8 @@ class PluginManager:
                 # 检查插件数量成就
                 plugin_count = len(self.core.plugins)
                 validator.check_plugin_count(plugin_count)
-            except Exception:
-                pass
+            except Exception as e:
+                print(f"[PluginManager] 错误: {e}")
 
     def stop(self):
         """停止所有插件"""
@@ -78,5 +78,5 @@ class PluginManager:
             try:
                 validator = get_validator()
                 validator.track_progress("session_end")
-            except Exception:
-                pass
+            except Exception as e:
+                print(f"[PluginManager] 错误: {e}")