website refactor

apps/website/lib/contracts/builders/ViewModelBuilder.ts

@@ -0,0 +1,25 @@
+/**
+ * ViewModel Builder Contract
+ * 
+ * Purpose: Transform API Transport DTOs into ViewModels
+ * 
+ * Rules:
+ * - Deterministic and side-effect free
+ * - No HTTP/API calls
+ * - Input: API Transport DTO
+ * - Output: ViewModel
+ * - Must be in lib/builders/view-models/
+ * - Must be named *ViewModelBuilder
+ * - Must have 'use client' directive
+ * - Must implement static build() method
+ */
+
+export interface ViewModelBuilder<TInput, TOutput> {
+  /**
+   * Transform DTO into ViewModel
+   * 
+   * @param dto - API Transport DTO
+   * @returns ViewModel
+   */
+  build(dto: TInput): TOutput;
+}