Add authentication system and admin dashboard

Security Features:
- Added User model with bcrypt password hashing
- Implemented Flask-Login for session management
- Protected all API write operations with @login_required decorator
- Added authentication routes (login/logout)

Admin Dashboard:
- Created comprehensive admin dashboard with statistics
- Profile management interface
- Skills management (add/edit/delete)
- Projects management with full CRUD operations
- Social links management
- Modern responsive UI with Bootstrap 5

New Files:
- models.py: Added User model with bcrypt
- routes/auth.py: Login/logout functionality
- routes/admin.py: Complete admin dashboard with CRUD operations
- templates/auth/login.html: Login page
- templates/admin/base.html: Admin base template
- templates/admin/dashboard.html: Main dashboard
- templates/admin/profile.html: Profile editor
- templates/admin/skills.html: Skills manager
- templates/admin/projects.html: Projects list
- templates/admin/project_form.html: Project editor
- templates/admin/social_links.html: Social links manager

Modified Files:
- app.py: Integrated Flask-Login and bcrypt, registered new blueprints
- requirements.txt: Added Flask-Login, Flask-Bcrypt, bcrypt
- init_db.py: Creates default admin user (admin/admin123)
- routes/api.py: Protected all write operations with authentication

Default Credentials:
- Username: admin
- Password: admin123
- ⚠️ MUST be changed after first login!

Benefits:
- Secure API access with session-based authentication
- User-friendly admin interface for content management
- No need to edit code or database directly
- Bcrypt password hashing for security
- Protected against unauthorized access

init_db.py

@@ -1,9 +1,9 @@
 """
 Database initialization script
-Populates the database with initial portfolio data
+Populates the database with initial portfolio data and creates default admin user
 """
 from app import app
-from models import db, Profile, Skill, Project, ProjectTag, SocialLink
+from models import db, User, Profile, Skill, Project, ProjectTag, SocialLink
 
 
 def init_database():
@@ -16,6 +16,15 @@ def init_database():
         print("Creating all tables...")
         db.create_all()
 
+        # Create default admin user
+        print("Creating default admin user...")
+        admin = User(
+            username='admin',
+            email='admin@hersel.it'
+        )
+        admin.set_password('admin123')  # CHANGE THIS PASSWORD AFTER FIRST LOGIN!
+        db.session.add(admin)
+
         # Create profile information
         print("Adding profile information...")
         profile = Profile(
@@ -169,11 +178,19 @@ def init_database():
         db.session.commit()
 
         print("\n✅ Database initialized successfully!")
+        print(f"   - Admin User: 1 record")
         print(f"   - Profile: 1 record")
         print(f"   - Skills: {len(skills_data)} records")
         print(f"   - Projects: 3 records")
         print(f"   - Project Tags: {len(project1_tags) + len(project2_tags) + len(project3_tags)} records")
         print(f"   - Social Links: {len(social_links_data)} records")
+        print("\n" + "="*60)
+        print("🔐 DEFAULT ADMIN CREDENTIALS")
+        print("="*60)
+        print(f"   Username: admin")
+        print(f"   Password: admin123")
+        print(f"   ⚠️  CHANGE THIS PASSWORD IMMEDIATELY AFTER FIRST LOGIN!")
+        print("="*60)
 
 
 if __name__ == '__main__':