feat: Add license and attribution routes, update templates and documentation

- Added a new license route to serve the LGPL license text.
- Introduced a new attribution page to acknowledge third-party software used in the project.
- Updated the base HTML template to include a link to the attribution page.
- Included the license router in the main application router.
- Added the license text file for LGPL to the static licenses directory.
- Updated the NOTICE file to include detailed attributions for third-party libraries.
- Added a new requirements-dev.txt for license compliance checking.
- Updated the requirements.txt to clarify the LGPL license for Paramiko.

frontend/templates/base.html

@@ -108,6 +108,7 @@
         <a href="/terms" class="text-blue-500 hover:underline">Terms</a> - 
         <a href="/cookies" class="text-blue-500 hover:underline">Cookies</a> - 
         <a href="/license" class="text-blue-500 hover:underline">License</a> - 
+        <a href="/attribution" class="text-blue-500 hover:underline">Attributions</a> - 
         <span class="text-xs">Version {{ app_version|default(version, true) }}</span>
       </div>
     </footer>