Fix macOS Bluetooth permissions by adding proper entitlements

- Create separate bitchat-macOS.entitlements file with com.apple.security.device.bluetooth
- Update project.yml to use the macOS-specific entitlements for the macOS target
- Regenerate Xcode project with proper entitlements configuration

This fixes the 'Bluetooth unsupported' issue on macOS which was caused by missing
device.bluetooth entitlement required for sandboxed apps

bitchat/bitchat-macOS.entitlements

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.chat.bitchat</string>
+	</array>
+	<key>com.apple.security.device.bluetooth</key>
+	<true/>
+</dict>
+</plist>