Add iOS TestFlight CI via Codemagic

Set up automated cloud iOS builds and TestFlight distribution without a
local Mac:
- Add codemagic.yaml: iOS->TestFlight workflow with automatic signing,
  build-number auto-increment, triggered by the vX.Y.Z release tags.
- Set the iOS bundle identifier to net.oott-security.app (was the
  placeholder com.example.frontend).
- Set the iOS display name to OOTT.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/ios/Runner/Info.plist

@@ -5,7 +5,7 @@
 		<key>CFBundleDevelopmentRegion</key>
 		<string>$(DEVELOPMENT_LANGUAGE)</string>
 		<key>CFBundleDisplayName</key>
-		<string>Frontend</string>
+		<string>OOTT</string>
 		<key>CFBundleExecutable</key>
 		<string>$(EXECUTABLE_NAME)</string>
 		<key>CFBundleIdentifier</key>