Add PDF reports, file uploads, admin auth, and comprehensive tests

Features:
- PDF service for generating task reports with ReportLab-style formatting
- Storage service for file uploads (local and S3-compatible)
- Admin authentication middleware with JWT support
- Admin user model and repository

Infrastructure:
- Updated Docker configuration for admin panel builds
- Email service enhancements for task notifications
- Updated router with admin and file upload routes
- Environment configuration updates

Tests:
- Unit tests for handlers (auth, residence, task)
- Unit tests for models (user, residence, task)
- Unit tests for repositories (user, residence, task)
- Unit tests for services (residence, task)
- Integration test setup
- Test utilities for mocking database and services

Database:
- Admin user seed data
- Updated test data seeds

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

internal/repositories/user_repo.go

@@ -80,10 +80,10 @@ func (r *UserRepository) FindByEmail(email string) (*models.User, error) {
 	return &user, nil
 }
 
-// FindByUsernameOrEmail finds a user by username or email
+// FindByUsernameOrEmail finds a user by username or email with profile preloaded
 func (r *UserRepository) FindByUsernameOrEmail(identifier string) (*models.User, error) {
 	var user models.User
-	if err := r.db.Where("LOWER(username) = LOWER(?) OR LOWER(email) = LOWER(?)", identifier, identifier).First(&user).Error; err != nil {
+	if err := r.db.Preload("Profile").Where("LOWER(username) = LOWER(?) OR LOWER(email) = LOWER(?)", identifier, identifier).First(&user).Error; err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {
 			return nil, ErrUserNotFound
 		}