feat(raw-materials): add bulk JSON import with upsert and full-page edit routes (#10)

Fixes #9

---------

Co-authored-by: Your Name <you@example.com>
Reviewed-on: #10
Co-authored-by: antigravity-bot <bot@kittisak.com>

packages/types/index.ts

@@ -143,6 +143,9 @@ export interface RawMaterial {
   name: string
   unit: string
   pricePerUnit: number
+  bomItems?: BomItem[]
+  createdAt?: string
+  updatedAt?: string
 }
 
 export interface BomItem {