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/dialog-manager.ts

@@ -3,13 +3,14 @@ import type { DialogOptions } from '../components/dialog/index.type';
 import type { ThemeConfig } from '../themes/types';
 import { themeManager } from '../services/theme';
 import { BaseManager } from '../core/base-manager';
+import { ManagerRegistry } from '../core/manager-registry';
 
 export class DialogManager extends BaseManager {
     private container: HTMLElement;
     private activeDialogs: BimDialog[] = [];
 
-    constructor(container: HTMLElement) {
-        super();
+    constructor(container: HTMLElement, registry: ManagerRegistry) {
+        super(registry);
         this.container = container;
     }