Prepare system extension support

SFM.System/Application.swift

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+import Library
+import MacLibrary
+import SwiftUI
+
+@main
+struct Application: App {
+    @NSApplicationDelegateAdaptor private var appDelegate: ApplicationDelegate
+
+    init() {
+        Variant.useSystemExtension = true
+    }
+
+    var body: some Scene {
+        MacApplication()
+    }
+}

SFM.System/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SFM.System/Assets.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "filename" : "apple-16 1x.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "apple-16 2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "filename" : "apple-32 1x.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "apple-32 2x 1.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "filename" : "apple-128 1x.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "apple-128 2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "filename" : "apple-256 1x.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "apple-256 2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "filename" : "apple-512 1x.png",
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "filename" : "apple-512 2x.png",
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SFM.System/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

SFM.System/Info.plist

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+<?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>NSUbiquitousContainers</key>
+	<dict>
+		<key>iCloud.io.nekohasekai.sfa</key>
+		<dict>
+			<key>NSUbiquitousContainerIsDocumentScopePublic</key>
+			<true/>
+			<key>NSUbiquitousContainerName</key>
+			<string>sing-box</string>
+			<key>NSUbiquitousContainerSupportedFolderLevels</key>
+			<string>Any</string>
+		</dict>
+	</dict>
+	<key>ITSAppUsesNonExemptEncryption</key>
+	<false/>
+</dict>
+</plist>

SFM.System/SFM.entitlements

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+<?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.developer.networking.networkextension</key>
+	<array>
+		<string>packet-tunnel-provider-systemextension</string>
+	</array>
+	<key>com.apple.developer.system-extension.install</key>
+	<true/>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.io.nekohasekai.sfa</string>
+	</array>
+	<key>com.apple.security.files.user-selected.read-write</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+</dict>
+</plist>