fix: add definite assignment assertion to api key dto properties

Author: Just-Bamford

apps/backend/src/modules/api-keys/dto/api-key.dto.ts

@@ -1,22 +1,22 @@
 export class CreateApiKeyDto {
-  name: string;
+  name!: string;
 }
 
 export class ApiKeyResponseDto {
-  id: string;
-  name: string;
+  id!: string;
+  name!: string;
   key?: string; // Only returned on creation
-  keyPreview: string; // Last 4 chars
-  createdAt: Date;
-  lastUsedAt: Date | null;
-  revokedAt: Date | null;
+  keyPreview!: string; // Last 4 chars
+  createdAt!: Date;
+  lastUsedAt!: Date | null;
+  revokedAt!: Date | null;
 }
 
 export class ApiKeyUsageDto {
-  id: string;
-  name: string;
-  keyPreview: string;
-  createdAt: Date;
-  lastUsedAt: Date | null;
-  requestCount: number;
+  id!: string;
+  name!: string;
+  keyPreview!: string;
+  createdAt!: Date;
+  lastUsedAt!: Date | null;
+  requestCount!: number;
 }