Migrate from Quart to Flask and add MariaDB dynamic database

Major Changes:
- Migrated web framework from Quart (async) to Flask (sync)
- Added MariaDB database integration with SQLAlchemy ORM
- Implemented dynamic content management for portfolio

New Features:
- Database models for Profile, Skills, Projects, ProjectTags, and SocialLinks
- RESTful API endpoints for CRUD operations on all entities
- Database initialization script (init_db.py) with sample data
- Docker Compose configuration with MariaDB service

Modified Files:
- app.py: Replaced Quart with Flask, added database initialization
- config.py: Added database configuration with environment variables
- routes/home.py: Converted async to sync, added database queries
- requirements.txt: Replaced Quart/Hypercorn with Flask/Gunicorn, added Flask-SQLAlchemy and PyMySQL
- docker-compose.yml: Added MariaDB service with health checks
- templates/: Updated all templates to use dynamic data from database with Jinja2
- .env.example: Added database configuration variables
- README.md: Complete rewrite with new setup instructions and API documentation

New Files:
- models.py: SQLAlchemy models for all database entities
- init_db.py: Database initialization script
- routes/api.py: REST API endpoints for content management

Benefits:
- Simplified architecture (sync vs async)
- Better ecosystem compatibility
- Dynamic content management via database
- Easy content updates through REST API
- Improved deployment with standard WSGI server (Gunicorn)

config.py

@@ -11,6 +11,21 @@ class Config(BaseSettings):
     DEBUG: bool = True
     SECRET_KEY: str = "default_secret_key"
 
+    # Database Configuration
+    DB_HOST: str = "localhost"
+    DB_PORT: int = 3306
+    DB_USER: str = "portfolio_user"
+    DB_PASSWORD: str = "portfolio_password"
+    DB_NAME: str = "portfolio_db"
+
+    @property
+    def SQLALCHEMY_DATABASE_URI(self) -> str:
+        """Construct MariaDB connection string"""
+        return f"mysql+pymysql://{self.DB_USER}:{self.DB_PASSWORD}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"
+
+    SQLALCHEMY_TRACK_MODIFICATIONS: bool = False
+    SQLALCHEMY_ECHO: bool = False  # Set to True for SQL query debugging
+
     class Config:
         env_file = ".env"