refactor: migrate to eslint flat config and format codebase with prettier

- Remove legacy .eslintrc.cjs and .eslintignore
- Add eslint.config.js with flat config, security rules (no-eval, no-implied-eval, no-new-func, no-script-url)
- Add .prettierrc and .prettierignore
- Format entire codebase with prettier

src/api/contests.ts

@@ -1,49 +1,50 @@
-import apiClient from './client'
+import apiClient from './client';
 
 export interface ContestInfo {
-  id: number
-  slug: string
-  name: string
-  description: string | null
-  prize_days: number
-  is_available: boolean
-  already_played: boolean
+  id: number;
+  slug: string;
+  name: string;
+  description: string | null;
+  prize_days: number;
+  is_available: boolean;
+  already_played: boolean;
 }
 
 export interface ContestGameData {
-  round_id: number
-  game_type: string
-  game_data: Record<string, any>
-  instructions: string
+  round_id: number;
+  game_type: string;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  game_data: Record<string, any>;
+  instructions: string;
 }
 
 export interface ContestResult {
-  is_winner: boolean
-  message: string
-  prize_days?: number
+  is_winner: boolean;
+  message: string;
+  prize_days?: number;
 }
 
 export interface ContestsCountResponse {
-  count: number
+  count: number;
 }
 
 export const contestsApi = {
   // Get count of available contests
   getCount: async (): Promise<ContestsCountResponse> => {
-    const response = await apiClient.get<ContestsCountResponse>('/cabinet/contests/count')
-    return response.data
+    const response = await apiClient.get<ContestsCountResponse>('/cabinet/contests/count');
+    return response.data;
   },
 
   // Get list of available contests
   getContests: async (): Promise<ContestInfo[]> => {
-    const response = await apiClient.get<ContestInfo[]>('/cabinet/contests')
-    return response.data
+    const response = await apiClient.get<ContestInfo[]>('/cabinet/contests');
+    return response.data;
   },
 
   // Get game data for a specific contest
   getContestGame: async (roundId: number): Promise<ContestGameData> => {
-    const response = await apiClient.get<ContestGameData>(`/cabinet/contests/${roundId}`)
-    return response.data
+    const response = await apiClient.get<ContestGameData>(`/cabinet/contests/${roundId}`);
+    return response.data;
   },
 
   // Submit answer for a contest
@@ -51,7 +52,7 @@ export const contestsApi = {
     const response = await apiClient.post<ContestResult>(`/cabinet/contests/${roundId}/answer`, {
       round_id: roundId,
       answer,
-    })
-    return response.data
+    });
+    return response.data;
   },
-}
+};