feat: Add initial Prisma schema with core models and implement host activity creation functionality.

prisma/schema.prisma

@@ -1074,6 +1074,7 @@ model ActivitiesMedia {
   activity      Activities @relation(fields: [activityXid], references: [id], onDelete: Cascade)
   mediaType     String     @map("media_type") @db.VarChar(30)
   mediaFileName String     @map("media_file_name") @db.VarChar(400)
+  isCoverImage  Boolean    @default(false) @map("is_cover_image")
   displayOrder  Int        @map("display_order")
   isActive      Boolean    @default(true) @map("is_active")
   createdAt     DateTime   @default(now()) @map("created_at")

src/modules/host/dto/createActivity.schema.ts

@@ -4,6 +4,7 @@ import { z } from 'zod';
 export const MediaDto = z.object({
   mediaType: z.string().optional(),
   mediaFileName: z.string(),
+  isCoverImage: z.boolean().optional().default(false),
 });
 
 /* ================= PRICE ================= */

src/modules/host/handlers/Activity_Hub/OnBoarding/CreateNewActivity.ts

@@ -59,6 +59,7 @@ export const handler = safeHandler(
     activity.media = media.map((m: any) => ({
       mediaType: m.mediaType ?? 'image',
       mediaFileName: m.mediaFileName,
+      isCoverImage: m.isCoverImage ?? false,
     }));
 
     /* 5️⃣ VALIDATION */

src/modules/host/services/host.service.ts

@@ -2945,6 +2945,7 @@ export class HostService {
             activityXid,
             mediaType: m.mediaType ?? 'unknown',
             mediaFileName: m.mediaFileName,
+            isCoverImage: m.isCoverImage ?? false,
             displayOrder: index + 1,
           })),
         });