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/database/database.go

@@ -124,6 +124,9 @@ func Migrate() error {
 		&models.ConfirmationCode{},
 		&models.PasswordResetCode{},
 
+		// Admin users (separate from app users)
+		&models.AdminUser{},
+
 		// Main entity tables (order matters for foreign keys!)
 		&models.Residence{},
 		&models.ResidenceShareCode{},
@@ -412,5 +415,26 @@ func migrateGoAdmin() error {
 	}
 
 	log.Info().Msg("GoAdmin migrations completed")
+
+	// Seed default Next.js admin user (email: admin@mycrib.com, password: admin123)
+	// bcrypt hash for "admin123": $2a$10$t5hGjdXQLxr9Z0193qx.Tef6hd1vYI3JvrfX/piKx2qS9UvQ41I9O
+	var adminCount int64
+	db.Raw(`SELECT COUNT(*) FROM admin_users WHERE email = 'admin@mycrib.com'`).Scan(&adminCount)
+	if adminCount == 0 {
+		log.Info().Msg("Seeding default admin user for Next.js admin panel...")
+		db.Exec(`
+			INSERT INTO admin_users (email, password, first_name, last_name, role, is_active, created_at, updated_at)
+			VALUES ('admin@mycrib.com', '$2a$10$t5hGjdXQLxr9Z0193qx.Tef6hd1vYI3JvrfX/piKx2qS9UvQ41I9O', 'Admin', 'User', 'super_admin', true, NOW(), NOW())
+		`)
+		log.Info().Msg("Default admin user created: admin@mycrib.com / admin123")
+	} else {
+		// Update existing admin password if needed
+		db.Exec(`
+			UPDATE admin_users SET password = '$2a$10$t5hGjdXQLxr9Z0193qx.Tef6hd1vYI3JvrfX/piKx2qS9UvQ41I9O'
+			WHERE email = 'admin@mycrib.com'
+		`)
+		log.Info().Msg("Updated admin@mycrib.com password to admin123")
+	}
+
 	return nil
 }