feat(center): add audit logs for auth and node operations

Fabric.Backend.Center/src/nodes/nodes.controller.ts

@@ -15,6 +15,7 @@ import {
 import { InjectRepository } from '@nestjs/typeorm';
 import { Repository } from 'typeorm';
 import { GuildNode } from '../entities/guild-node.entity';
+import { AuditService } from '../audit/audit.service';
 import { RegisterNodeDto } from './dto.register-node.dto';
 import { UpdateNodeStatusDto } from './dto.update-node-status.dto';
 
@@ -23,6 +24,7 @@ export class NodesController {
   constructor(
     @InjectRepository(GuildNode)
     private readonly nodeRepo: Repository<GuildNode>,
+    private readonly audit: AuditService,
   ) {}
 
   @Post('register')
@@ -52,6 +54,12 @@ export class NodesController {
       status: 'active',
     });
     const saved = await this.nodeRepo.save(node);
+    await this.audit.write({
+      action: 'node.register',
+      targetType: 'node',
+      targetId: saved.nodeId,
+      detail: JSON.stringify({ endpoint: saved.endpoint }),
+    });
 
     return {
       status: 'accepted',
@@ -78,6 +86,12 @@ export class NodesController {
     }
 
     const saved = await this.nodeRepo.save(node);
+    await this.audit.write({
+      action: 'node.heartbeat',
+      targetType: 'node',
+      targetId: saved.nodeId,
+      detail: JSON.stringify({ status: saved.status }),
+    });
     return {
       status: 'ok',
       nodeId: saved.nodeId,
@@ -98,6 +112,12 @@ export class NodesController {
 
     node.status = body.status;
     const saved = await this.nodeRepo.save(node);
+    await this.audit.write({
+      action: 'node.status.update',
+      targetType: 'node',
+      targetId: saved.nodeId,
+      detail: JSON.stringify({ status: saved.status }),
+    });
     return {
       id: saved.id,
       nodeId: saved.nodeId,