Fix logo display and job processing issues

- Embed logo as base64 data URL in templates to avoid static file issues
- Fix Flask route endpoint for /jobs (change function name to 'jobs')
- Change upload and session directories to relative paths for better portability
- Ensure directories are created at app startup

templates/index.html

@@ -150,7 +150,7 @@
 </head>
 <body>
     <div class="header">
-        <img src="{{ url_for('static', filename='trbc-logo-full.png') }}" alt="Logo" class="logo">
+        <img src="data:image/png;base64,{{ logo_b64 }}" alt="Logo" class="logo">
         <h1>End of Year Statements Processor</h1>
         <p>Upload PDF files or folders to automatically sort by address and merge by page count</p>