very first commit

src/app/models/category.model.ts

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+export interface Category {
+  categoryID: number;
+  name: string;
+  parentID: number;
+  icon?: string;
+}

src/app/models/index.ts

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+export * from './category.model';
+export * from './item.model';

src/app/models/item.model.ts

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+export interface Photo {
+  photo?: string;
+  video?: string;
+  url: string;
+  type?: string;
+}
+
+export interface Callback {
+  rating?: number;
+  content?: string;
+  userID?: string;
+  answer?: string;
+  timestamp?: string;
+}
+
+export interface Question {
+  question: string;
+  answer: string;
+  upvotes: number;
+  downvotes: number;
+}
+
+export interface Item {
+  categoryID: number;
+  itemID: number;
+  name: string;
+  photos: Photo[] | null;
+  description: string;
+  currency: string;
+  price: number;
+  discount: number;
+  remainings?: string;
+  rating: number;
+  callbacks: Callback[] | null;
+  questions: Question[] | null;
+  partnerID?: string;
+  quantity?: number; // For cart items
+}
+
+export interface CartItem extends Item {
+  quantity: number;
+}