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>

app/src/main/res/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#2196F3</color>
+</resources>

app/src/main/res/values/secrets.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Replace the placeholder values here with your real API keys.
+  DO NOT commit real keys to source control — use a secrets manager or
+  local.properties + BuildConfig injection instead.
+-->
+<resources>
+    <!-- Dropbox: create an app at https://www.dropbox.com/developers/apps -->
+    <string name="dropbox_app_key" translatable="false">YOUR_DROPBOX_APP_KEY</string>
+    <!-- Google Drive: create OAuth 2.0 client ID at https://console.cloud.google.com -->
+    <string name="google_client_id" translatable="false">YOUR_GOOGLE_CLIENT_ID</string>
+    <!-- OneDrive: create app at https://portal.azure.com/#blade/Microsoft_AAD_RegisteredApps -->
+    <string name="onedrive_client_id" translatable="false">YOUR_ONEDRIVE_CLIENT_ID</string>
+</resources>

app/src/main/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">SyncFlow</string>
+</resources>

app/src/main/res/values/themes.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.SyncFlow" parent="Theme.AppCompat.Light.NoActionBar" />
+    <style name="Theme.SyncFlow.Splash" parent="Theme.SplashScreen">
+        <item name="windowSplashScreenBackground">@android:color/white</item>
+        <item name="postSplashScreenTheme">@style/Theme.SyncFlow</item>
+    </style>
+</resources>