Adds stalwart-dev/integration_android_test.sh which starts Stalwart on random ports, detects a connected Android emulator via adb, sets STALWART_IMAP_HOST=10.0.2.2 (emulator-to-host alias), and runs the existing integration_test/ suite on the emulator. Wires it up as `task integration-android` in Taskfile.yml. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>