chore: add user service layer, markdown support, and rename model classes

- Introduce UserService with create_user method and password hashing
- Add UserMapper and BaseMapper for database operations
- Create service, mapper, and model registry modules with cached factories
- Rename User model class to UserModel for consistency
- Make email field optional in both RegisterForm and UserModel
- Integrate MarkdownExtension into Jinja2 environment
- Add AboutHTMLView and AboutMDView routes with .html and .md endpoints
- Append jinja-markdown2 and mistune to project dependencies
- Implement markdown rendering in html-frame.js for .md file responses
- Create markdown-frame.js custom element for standalone markdown display
- Add style.css with dark theme and orange heading colors
- Update Dockerfile to Python 3.12.8-alpine3.21 and fix CMD syntax
- Extend .gitignore with .resources, .backup*, and docs directories
- Refactor form.py with MIT license header and code documentation
- Add license and documentation headers to system/http.py
- Fix mobile form layout with full-width and full-height constraints

Dockerfile

@@ -1,5 +1,5 @@
 FROM surnet/alpine-wkhtmltopdf:3.21.2-0.12.6-full as wkhtmltopdf 
-FROM python:3.10-alpine
+FROM python:3.12.8-alpine3.21
 WORKDIR /code
 ENV FLASK_APP=app.py
 ENV FLASK_RUN_HOST=0.0.0.0
@@ -37,5 +37,5 @@ RUN pip install --upgrade pip
 RUN pip install -e .
 EXPOSE 8081
 
-python -m snek.app
+CMD ["python","-m","snek.app"]
 #CMD ["gunicorn", "-w", "10", "-k", "aiohttp.worker.GunicornWebWorker", "snek.gunicorn:app","--bind","0.0.0.0:8081"]