Add Docker, migrations, and initial database setup

Added Dockerfile and docker-compose.yaml for containerization. Introduced Alembic migrations with initial schema and a migration to alter column types. Added requirements.txt for dependencies and removed temp.py cleanup script. Updated .gitignore to allow tracking of migration files.

requirements.txt

@@ -0,0 +1,18 @@
+alembic==1.16.1
+blinker==1.9.0
+click==8.2.1
+colorama==0.4.6
+Flask==3.1.1
+Flask-Login==0.6.3
+Flask-Migrate==4.1.0
+Flask-SQLAlchemy==3.1.1
+Flask-WTF==1.2.2
+greenlet==3.2.2
+itsdangerous==2.2.0
+Jinja2==3.1.6
+Mako==1.3.10
+MarkupSafe==3.0.2
+SQLAlchemy==2.0.41
+typing_extensions==4.13.2
+Werkzeug==3.1.3
+WTForms==3.2.1