Initial commit: HOA Financial Intelligence Platform MVP

Multi-tenant financial management platform for homeowner associations featuring:
- NestJS backend with 16 modules (auth, accounts, transactions, budgets, units,
  invoices, payments, vendors, reserves, investments, capital projects, reports)
- React + Mantine frontend with dashboard, CRUD pages, and financial reports
- Schema-per-tenant PostgreSQL isolation with JWT-based tenant resolution
- Docker Compose infrastructure (nginx, backend, frontend, postgres, redis)
- Comprehensive seed data for Sunrise Valley HOA demo
- 39 API endpoints with Swagger documentation
- Double-entry bookkeeping with journal entries
- Budget vs actual reporting and Sankey cash flow visualization

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/modules/users/users.service.ts

@@ -0,0 +1,41 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { User } from './entities/user.entity';
+
+@Injectable()
+export class UsersService {
+  constructor(
+    @InjectRepository(User)
+    private usersRepository: Repository<User>,
+  ) {}
+
+  async findByEmail(email: string): Promise<User | null> {
+    return this.usersRepository.findOne({
+      where: { email: email.toLowerCase() },
+    });
+  }
+
+  async findById(id: string): Promise<User | null> {
+    return this.usersRepository.findOne({ where: { id } });
+  }
+
+  async findByIdWithOrgs(id: string): Promise<User | null> {
+    return this.usersRepository.findOne({
+      where: { id },
+      relations: ['userOrganizations', 'userOrganizations.organization'],
+    });
+  }
+
+  async create(data: Partial<User>): Promise<User> {
+    const user = this.usersRepository.create({
+      ...data,
+      email: data.email?.toLowerCase(),
+    });
+    return this.usersRepository.save(user);
+  }
+
+  async updateLastLogin(id: string): Promise<void> {
+    await this.usersRepository.update(id, { lastLoginAt: new Date() });
+  }
+}