Add Share Extension for importing recipes via URL

Adds a Share Extension so users can share URLs from Safari (or any app)
to open the main app with the ImportURLSheet pre-filled. Uses a custom
URL scheme (nextcloud-cookbook://) as the bridge between the extension
and the main app.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Nextcloud-Cookbook-iOS-Client-Info.plist

@@ -2,6 +2,17 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleURLName</key>
+			<string>com.vincentmeilinger.nextcloud-cookbook</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>nextcloud-cookbook</string>
+			</array>
+		</dict>
+	</array>
 	<key>NSRemindersFullAccessUsageDescription</key>
 	<string>This app uses Reminders to save your grocery list items.</string>
 </dict>