Neo platform - First Version

backend/src/tenant/tenant.decorator.ts

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+import { createParamDecorator, ExecutionContext } from '@nestjs/common';
+
+export const TenantId = createParamDecorator(
+  (data: unknown, ctx: ExecutionContext) => {
+    const request = ctx.switchToHttp().getRequest();
+    return request.raw.tenantId;
+  },
+);

backend/src/tenant/tenant.middleware.ts

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+import { Injectable, NestMiddleware } from '@nestjs/common';
+import { FastifyRequest, FastifyReply } from 'fastify';
+
+@Injectable()
+export class TenantMiddleware implements NestMiddleware {
+  use(req: FastifyRequest['raw'], res: FastifyReply['raw'], next: () => void) {
+    const tenantId = req.headers['x-tenant-id'] as string;
+    
+    if (tenantId) {
+      // Attach tenantId to request object
+      (req as any).tenantId = tenantId;
+    }
+    
+    next();
+  }
+}

backend/src/tenant/tenant.module.ts

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+import { Module, NestModule, MiddlewareConsumer } from '@nestjs/common';
+import { TenantMiddleware } from './tenant.middleware';
+
+@Module({})
+export class TenantModule implements NestModule {
+  configure(consumer: MiddlewareConsumer) {
+    consumer.apply(TenantMiddleware).forRoutes('*');
+  }
+}