fix(injection): findUnique 使用命名唯一索引 uk_adoption_id

Prisma 的 @@unique 使用自定义名 "uk_adoption_id" 后，
findUnique 的 where 必须用 { uk_adoption_id: { adoptionId } }
而非 { adoptionId }，否则报 PrismaClientValidationError。

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/mining-blockchain-service/src/infrastructure/persistence/repositories/adoption-injection-record.repository.impl.ts

@@ -44,7 +44,7 @@ export class AdoptionInjectionRecordRepositoryImpl implements IAdoptionInjection
 
   async findByAdoptionId(adoptionId: string): Promise<AdoptionInjectionRecordDto | null> {
     const record = await this.prisma.adoptionInjectionRecord.findUnique({
-      where: { adoptionId },
+      where: { uk_adoption_id: { adoptionId } },
     });
     return record ? this.mapToDto(record) : null;
   }