refactor(managers): accept registry parameter via constructor injection

All 16 managers now receive ManagerRegistry instance through constructor
instead of calling ManagerRegistry.getInstance(). This enables each
BimEngine instance to have its own isolated set of managers.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/managers/ai-chat-manager.ts

@@ -18,8 +18,8 @@ export class AiChatManager {
     /** 是否已初始化 */
     private initialized = false;
 
-    constructor() {
-        this.registry = ManagerRegistry.getInstance();
+    constructor(registry: ManagerRegistry) {
+        this.registry = registry;
     }
 
     /**