feat: implement error handling and validation middleware, enhance result handling

Co-authored-by: Copilot <copilot@github.com>

apps/backend/src/modules/sport/services/sport.service.ts

@@ -1,5 +1,6 @@
-import { Prisma } from '@/generated/prisma/client';
+import { Prisma, Sport } from '@/generated/prisma/client';
 import { db } from '@/lib/prisma';
+import { ok, Result } from '@/lib/result';
 import { v7 as uuidv7 } from 'uuid';
 
 export type CreateSportInput = {
@@ -51,10 +52,11 @@ async function buildUniqueSlug(source: string, excludeSportId?: string): Promise
   }
 }
 
-export async function listSports() {
-  return db.sport.findMany({
+export async function listSports(): Promise<Result<Sport[]>> {
+  const sports = await db.sport.findMany({
     orderBy: { name: 'asc' },
   });
+  return ok(sports);
 }
 
 export async function createSport(input: CreateSportInput) {