bottlepy/bottle ? reverse-engineered prompt

Build me a tiny Python web framework that is super simple to use and easy to drop into a project as a single file.

I want it to let me map URLs to functions, including dynamic paths like /hello/<name>, and have a built in way to return HTML with simple templates. It should also make it easy to read form data, file uploads, cookies, headers, and other basic request info without a lot of setup.

Please include a small development server so I can run it locally right away, and make it work as a WSGI app so it can be used with common production servers too. Keep it lightweight, with no dependencies beyond the Python standard library if possible.

Add a few clear example routes and a simple hello world style demo so I can see how it works right away. If you need to check current Python docs or WSGI details, go ahead and look them up online.