refactor(api): replace new Logger() with DI LoggerService and split large files

- Migrate 30 files from `new Logger(ClassName.name)` to injected LoggerService
  for consistent PII masking and centralized logging config
- Split prisma-admin-query.repository.ts (313→121 lines) into admin-stats.queries.ts
  and admin-user.queries.ts
- Split admin.controller.ts (285→154 lines) into admin-moderation.controller.ts
- Split prisma-listing.repository.ts (274→111 lines) into listing-read.queries.ts
- Update 28 test files with mock LoggerService
- All 831 tests passing, zero direct new Logger() calls remaining

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/leads/application/__tests__/create-lead.handler.spec.ts

@@ -27,10 +27,13 @@ describe('CreateLeadHandler', () => {
       agent: { findUnique: vi.fn() },
     };
 
+    const mockLogger = { log: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn(), verbose: vi.fn() };
+
     handler = new CreateLeadHandler(
       mockLeadRepo as any,
       mockEventBus as unknown as EventBus,
       mockPrisma as any,
+      mockLogger as any,
     );
   });
 

apps/api/src/modules/leads/application/__tests__/delete-lead.handler.spec.ts

@@ -28,10 +28,13 @@ describe('DeleteLeadHandler', () => {
       agent: { findUnique: vi.fn() },
     };
 
+    const mockLogger = { log: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn(), verbose: vi.fn() };
+
     handler = new DeleteLeadHandler(
       mockLeadRepo as any,
       mockEventBus as unknown as EventBus,
       mockPrisma as any,
+      mockLogger as any,
     );
   });
 

apps/api/src/modules/leads/application/__tests__/update-lead-status.handler.spec.ts

@@ -28,10 +28,13 @@ describe('UpdateLeadStatusHandler', () => {
       agent: { findUnique: vi.fn() },
     };
 
+    const mockLogger = { log: vi.fn(), warn: vi.fn(), error: vi.fn(), debug: vi.fn(), verbose: vi.fn() };
+
     handler = new UpdateLeadStatusHandler(
       mockLeadRepo as any,
       mockEventBus as unknown as EventBus,
       mockPrisma as any,
+      mockLogger as any,
     );
   });
 

apps/api/src/modules/leads/application/commands/create-lead/create-lead.handler.ts

@@ -1,7 +1,7 @@
-import { Inject, Logger } from '@nestjs/common';
+import { Inject } from '@nestjs/common';
 import { CommandHandler, type EventBus, type ICommandHandler } from '@nestjs/cqrs';
 import { createId } from '@paralleldrive/cuid2';
-import { NotFoundException, ValidationException, type PrismaService } from '@modules/shared';
+import { NotFoundException, ValidationException, type PrismaService, type LoggerService } from '@modules/shared';
 import { LeadEntity } from '../../../domain/entities/lead.entity';
 import { LEAD_REPOSITORY, type ILeadRepository } from '../../../domain/repositories/lead.repository';
 import { LeadScore } from '../../../domain/value-objects/lead-score.vo';
@@ -15,12 +15,11 @@ export interface CreateLeadResult {
 
 @CommandHandler(CreateLeadCommand)
 export class CreateLeadHandler implements ICommandHandler<CreateLeadCommand> {
-  private readonly logger = new Logger(CreateLeadHandler.name);
-
   constructor(
     @Inject(LEAD_REPOSITORY) private readonly leadRepo: ILeadRepository,
     private readonly eventBus: EventBus,
     private readonly prisma: PrismaService,
+    private readonly logger: LoggerService,
   ) {}
 
   async execute(command: CreateLeadCommand): Promise<CreateLeadResult> {
@@ -62,7 +61,7 @@ export class CreateLeadHandler implements ICommandHandler<CreateLeadCommand> {
       this.eventBus.publish(event);
     }
 
-    this.logger.log(`Lead ${id} created by agent ${agent.id}`);
+    this.logger.log(`Lead ${id} created by agent ${agent.id}`, 'CreateLeadHandler');
 
     return {
       id,

apps/api/src/modules/leads/application/commands/delete-lead/delete-lead.handler.ts

@@ -1,17 +1,16 @@
-import { Inject, Logger } from '@nestjs/common';
+import { Inject } from '@nestjs/common';
 import { CommandHandler, type EventBus, type ICommandHandler } from '@nestjs/cqrs';
-import { ForbiddenException, NotFoundException, type PrismaService } from '@modules/shared';
+import { ForbiddenException, NotFoundException, type PrismaService, type LoggerService } from '@modules/shared';
 import { LEAD_REPOSITORY, type ILeadRepository } from '../../../domain/repositories/lead.repository';
 import { DeleteLeadCommand } from './delete-lead.command';
 
 @CommandHandler(DeleteLeadCommand)
 export class DeleteLeadHandler implements ICommandHandler<DeleteLeadCommand> {
-  private readonly logger = new Logger(DeleteLeadHandler.name);
-
   constructor(
     @Inject(LEAD_REPOSITORY) private readonly leadRepo: ILeadRepository,
     private readonly eventBus: EventBus,
     private readonly prisma: PrismaService,
+    private readonly logger: LoggerService,
   ) {}
 
   async execute(command: DeleteLeadCommand): Promise<void> {
@@ -35,6 +34,6 @@ export class DeleteLeadHandler implements ICommandHandler<DeleteLeadCommand> {
 
     await this.leadRepo.delete(command.leadId);
 
-    this.logger.log(`Lead ${command.leadId} deleted by agent ${agent.id}`);
+    this.logger.log(`Lead ${command.leadId} deleted by agent ${agent.id}`, 'DeleteLeadHandler');
   }
 }

apps/api/src/modules/leads/application/commands/update-lead-status/update-lead-status.handler.ts

@@ -1,18 +1,17 @@
-import { Inject, Logger } from '@nestjs/common';
+import { Inject } from '@nestjs/common';
 import { CommandHandler, type EventBus, type ICommandHandler } from '@nestjs/cqrs';
-import { ForbiddenException, NotFoundException, type PrismaService } from '@modules/shared';
+import { ForbiddenException, NotFoundException, type PrismaService, type LoggerService } from '@modules/shared';
 import { type LeadStatus } from '../../../domain/entities/lead.entity';
 import { LEAD_REPOSITORY, type ILeadRepository } from '../../../domain/repositories/lead.repository';
 import { UpdateLeadStatusCommand } from './update-lead-status.command';
 
 @CommandHandler(UpdateLeadStatusCommand)
 export class UpdateLeadStatusHandler implements ICommandHandler<UpdateLeadStatusCommand> {
-  private readonly logger = new Logger(UpdateLeadStatusHandler.name);
-
   constructor(
     @Inject(LEAD_REPOSITORY) private readonly leadRepo: ILeadRepository,
     private readonly eventBus: EventBus,
     private readonly prisma: PrismaService,
+    private readonly logger: LoggerService,
   ) {}
 
   async execute(command: UpdateLeadStatusCommand): Promise<void> {
@@ -43,6 +42,6 @@ export class UpdateLeadStatusHandler implements ICommandHandler<UpdateLeadStatus
       this.eventBus.publish(event);
     }
 
-    this.logger.log(`Lead ${command.leadId} status updated to ${command.newStatus} by agent ${agent.id}`);
+    this.logger.log(`Lead ${command.leadId} status updated to ${command.newStatus} by agent ${agent.id}`, 'UpdateLeadStatusHandler');
   }
 }