Initial commit — SyncFlow Android file sync app

Supports WebDAV, SFTP, SFTPGo, Nextcloud, ownCloud, Google Drive,
Dropbox, and OneDrive. Credentials encrypted with Android Keystore.
Biometric app-lock, conflict resolution, and auto-sync via WorkManager.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,12 @@
+*.iml
+.gradle/
+local.properties
+.idea/
+.DS_Store
+/build/
+app/build/
+captures/
+.externalNativeBuild/
+.cxx/
+*.keystore
+*.jks