Added standardized colors

models/Category.ts

@@ -1,11 +1,14 @@
 import { z } from 'zod'
+import type { RPGColor } from './Color'
 
 export interface Category {
   id: number
   name: string
+  color?: RPGColor
 }
 
 export const categorySchema = z.object({
   id: z.number().int(),
-  name: z.string()
+  name: z.string(),
+  color: z.string().default("black")
 })