chore: Update changelog for version 1.0.7 and reflect new beta version in landing screen

Author: LotusSerene

changelog.md

@@ -190,3 +190,7 @@
 ## 1.0.6
 
 - Removed Supabase
+
+## 1.0.7
+
+- Add Openrouter models

frontend/lib/screens/landing_screen.dart

@@ -57,7 +57,7 @@ class LandingScreen extends StatelessWidget {
           ),
           const SizedBox(height: 16),
           Text(
-            'Beta v1.0.6',
+            'Beta v1.0.7',
             style: Theme.of(context).textTheme.bodySmall?.copyWith(
                   color: Theme.of(context).colorScheme.primary,
                 ),