feat: persist local configuration and device identity (#3)

Store receiver and identity together in Keychain, with versioned tracking
preferences, explicit authorization retry and stable Settings focus.
Adopt free Apple Development locally and credential-free ad hoc CI.
Run configuration and focus tests through both CI toolchains.

Final decisions: https://github.com/jayanezj/traccar-client-macos/issues/3#issuecomment-6396087703

.gitignore

@@ -35,6 +35,7 @@ xcuserdata/
 *~
 
 # Local secrets and signing material (keep example configuration)
+/Configuration/Signing.local.xcconfig
 .env
 .env.*
 !.env.example