Feat forgot password endpoint

[RUKAYAT-CODER]

close #598
close #601

Task 1: Excel and PDF Export Endpoints
Reports Module Created:

backend/contrib/src/reports/reports.module.ts - Module definition with Asset entity
backend/contrib/src/reports/reports.service.ts - Service with Excel and PDF generation
backend/contrib/src/reports/reports.controller.ts - Controller with protected endpoints
Endpoints Implemented:

GET /reports/export/excel - Generates .xlsx using exceljs with formatted table
GET /reports/export/pdf - Generates PDF using pdfkit with title, date, and asset table
Features:

Both endpoints protected by JwtAuthGuard
Excel columns: Asset ID, Name, Category, Department, Status, Condition, Purchase Price, Location, Created Date
PDF mirrors same columns in readable layout
Proper Content-Type and Content-Disposition headers

Task 2: Forgot Password and Reset Password Endpoints
Password Reset Token Entity:

backend/contrib/src/auth/password-reset-token.entity.ts - Entity with id, userId, tokenHash, expiresAt, usedAt
Mail Module:

backend/contrib/src/mail/mail.module.ts - Mail module configuration
backend/contrib/src/mail/mail.service.ts - Nodemailer service for email sending
Auth Endpoints:

POST /auth/forgot-password - Accepts { email }, generates 15-minute token, stores hashed token, sends email
POST /auth/reset-password - Accepts { token, newPassword }, validates token, updates password, invalidates token
DTOs Created:

backend/contrib/src/auth/dto/forgot-password.dto.ts - Email validation
backend/contrib/src/auth/dto/reset-password.dto.ts - Token and new password validation
Environment Variables Required:

MAIL_HOST, MAIL_PORT, MAIL_USER, MAIL_PASS, MAIL_FROM
FRONTEND_URL (optional, defaults to http://localhost:3000/)
All dependencies have been installed, modules properly configured, and the ReportsModule has been added to the main AppModule. The implementation follows NestJS best practices with proper error handling, validation, and security measures.

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