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

Configuration/Signing.xcconfig

@@ -0,0 +1,9 @@
+// Local apps use an Apple-issued development identity. No provisioning profile is needed
+// while the app has no restricted entitlements. CI explicitly overrides this with ad hoc signing.
+CODE_SIGN_STYLE = Manual
+CODE_SIGN_IDENTITY = Apple Development
+CODE_SIGNING_ALLOWED = YES
+CODE_SIGNING_REQUIRED = YES
+
+// Set DEVELOPMENT_TEAM locally; optionally select a certificate if several are available.
+#include? "Signing.local.xcconfig"