Implement a new `/card` POST endpoint to receive sensitive number data (e.g., credit card details) and securely DM it to the bot owner. Define a `NumberData` Pydantic model for this purpose.
Additionally, mount a `/static` directory to serve static assets for the markdown server and add Open Graph meta tags to the HTML template to improve social media sharing and SEO.
Update inline CSS within `HTML_TEMPLATE` and the root endpoint's HTML.
Double curly braces `{{` and `}}` are now used for CSS rules to prevent the templating engine from misinterpreting single curly braces `{}` as placeholders, ensuring correct CSS rendering.
Integrate and start a new markdown server to host the Terms of Service (TOS) and Privacy Policy documents. This server runs in a separate thread on port 5006, making these legal documents accessible via HTTP.
