phase-6: add registry-driven dynamic page-section-widget rendering engine

src/app/widgets/registry/widget-registry.service.ts

@@ -0,0 +1,38 @@
+import { Injectable } from '@angular/core';
+import { RegisteredWidget } from '../contracts/widget-component.contract';
+
+@Injectable({ providedIn: 'root' })
+export class WidgetRegistryService {
+  private readonly widgets = new Map<string, RegisteredWidget>();
+
+  register(widget: RegisteredWidget): void {
+    this.widgets.set(this.toKey(widget.type, widget.version), widget);
+  }
+
+  registerMany(widgets: RegisteredWidget[]): void {
+    for (const widget of widgets) {
+      this.register(widget);
+    }
+  }
+
+  resolve(type: string, version: string): RegisteredWidget | null {
+    const exact = this.widgets.get(this.toKey(type, version));
+    if (exact) {
+      return exact;
+    }
+
+    const sameType = Array.from(this.widgets.values())
+      .filter(widget => widget.type === type)
+      .sort((a, b) => b.version.localeCompare(a.version));
+
+    return sameType[0] ?? null;
+  }
+
+  list(): RegisteredWidget[] {
+    return Array.from(this.widgets.values());
+  }
+
+  private toKey(type: string, version: string): string {
+    return `${type}@${version}`;
+  }
+}