Improvements to Flutter client (#1042)

* Chat improvements

* Delete/reset account via API for Flutter app

* Fix tests.

* Add "contact us" to settings

* Update mobile/lib/screens/chat_conversation_screen.dart

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: Juan José Mata <jjmata@jjmata.com>

* Improve LLM special token detection

* Deactivated user shouldn't have API working

* Fix tests

* API-Key usage

* Flutter app launch failure on no network

* Handle deletion/reset delays

* Local cached data may become stale

* Use X-Api-Key correctly!

---------

Signed-off-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

config/routes.rb

@@ -394,6 +394,9 @@ Rails.application.routes.draw do
         end
       end
 
+      delete "users/reset", to: "users#reset"
+      delete "users/me", to: "users#destroy"
+
       # Test routes for API controller testing (only available in test environment)
       if Rails.env.test?
         get "test", to: "test#index"