Fix client-side issues: logo loading and JS errors

- Replace base64 logo with static file reference to avoid ERR_INVALID_URL
- Add missing status element to index.html to fix TypeError in XMLHttpRequest
- Reduce MAX_CONTENT_LENGTH from 1000TB to 100GB for practicality
- Update all templates to use logo_url instead of logo_b64
- Update Waitress max_request_body_size to match Flask limit

templates/results.html

@@ -140,7 +140,7 @@
 </head>
 <body>
     <div class="header">
-        <img src="data:image/png;base64,{{ logo_b64 }}" alt="Logo" class="logo">
+        <img src="{{ logo_url }}" alt="Logo" class="logo">
         <h1>Processing Results</h1>
         <p>View and download your completed PDF processing jobs</p>