feat: Add Air Quality page and OpenAQ API integration #32
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This change introduces a new "Air Quality" page to the application. It includes a new frontend page with HTML, CSS, and JavaScript, and a new backend endpoint that fetches data from the OpenAQ API. The backend is configured to use an API key from an environment variable, with a graceful error message on the frontend if the key is not provided.
PR created automatically by Jules for task 8855367269398809479 started by @GYFX35