docs: initial Seaca repo — README and mobile roadmap

Kotlin Android client for SAC with FCM push and admin enrollment codes.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

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+# Android / Gradle
+*.iml
+.gradle/
+/local.properties
+/.idea/
+.DS_Store
+/build/
+/captures/
+.externalNativeBuild/
+.cxx/
+*.apk
+*.aab
+*.ap_
+*.dex
+
+# Kotlin
+.kotlin/
+
+# Secrets
+google-services.json
+*.keystore
+*.jks
+local.properties
+secrets.properties
+
+# Env
+.env
+.env.*