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

app.py

@@ -4,10 +4,13 @@
 # Copyright Hersel Giannella
 
 from flask import Flask, send_from_directory
+from flask_login import LoginManager
 from config import config
-from models import db
+from models import db, bcrypt, User
 from routes.home import route_home
 from routes.api import route_api
+from routes.auth import route_auth
+from routes.admin import route_admin
 
 app = Flask(
     __name__,
@@ -21,8 +24,21 @@ app.config['SQLALCHEMY_DATABASE_URI'] = config.SQLALCHEMY_DATABASE_URI
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = config.SQLALCHEMY_TRACK_MODIFICATIONS
 app.config['SQLALCHEMY_ECHO'] = config.SQLALCHEMY_ECHO
 
-# Initialize database
+# Initialize extensions
 db.init_app(app)
+bcrypt.init_app(app)
+
+# Initialize Flask-Login
+login_manager = LoginManager()
+login_manager.init_app(app)
+login_manager.login_view = 'auth.login'
+login_manager.login_message = 'Per accedere a questa pagina devi effettuare il login.'
+login_manager.login_message_category = 'warning'
+
+@login_manager.user_loader
+def load_user(user_id):
+    """Load user for Flask-Login"""
+    return User.query.get(int(user_id))
 
 # favicon.ico, sitemap.xml and robots.txt
 @app.route('/favicon.ico')
@@ -40,6 +56,8 @@ def robots():
 # BluePrint Routes
 app.register_blueprint(route_home)
 app.register_blueprint(route_api)
+app.register_blueprint(route_auth)
+app.register_blueprint(route_admin)
 
 if __name__ == '__main__':
     app.run(debug=config.DEBUG, host=config.APP_HOST, port=config.APP_PORT)