feat(client/native): stats-overhaul Phase1 — 四端实时统计采集端

各原生侧把 libbox/Clash 的实时上下行/延迟经冻结的 pangolin/vpn/stats channel
生产真实帧:
- iOS/macOS 新增 StatsClient.swift(LibboxNewCommandClient,statusInterval 1s,
  uplink/downlink/总量 + urltest 延迟映射契约字段),VpnManager/VpnChannel 状态
  观察驱动 start/stop,pbxproj 登记。
- Android PangolinVpnService.kt 延迟修复。

契约字段 uploadBytes/downloadBytes/uploadSpeed/downloadSpeed/urltestResults 不改。
真机验证(连接后实时跳动)为运行时步骤,见计划 Phase1 待办。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/ios/Runner.xcodeproj/project.pbxproj

@@ -15,6 +15,7 @@
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 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
 		CAFE000000000001000000AB /* VpnManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = CAFE000000000001000000AA /* VpnManager.swift */; };
+		CAFE000000000002000000AB /* StatsClient.swift in Sources */ = {isa = PBXBuildFile; fileRef = CAFE000000000002000000AA /* StatsClient.swift */; };
 		CAFE000000000002000000AB /* PacketTunnelProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = CAFE000000000002000000AA /* PacketTunnelProvider.swift */; };
 		CAFE000000000004000000AB /* PacketTunnel.appex in Embed App Extensions */ = {isa = PBXBuildFile; fileRef = CAFE000000000004000000AA /* PacketTunnel.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
 		CAFE000000000006000000AC /* MemoryMonitor.swift in Sources */ = {isa = PBXBuildFile; fileRef = CAFE000000000006000000AB /* MemoryMonitor.swift */; };
@@ -78,6 +79,7 @@
 		97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = LaunchScreen.storyboard; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		C890E0E50FB9E2909B5EA7B8 /* Pods-Runner.profile.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.profile.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig"; sourceTree = "<group>"; };
 		CAFE000000000001000000AA /* VpnManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = VpnManager.swift; sourceTree = "<group>"; };
+		CAFE000000000002000000AA /* StatsClient.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StatsClient.swift; sourceTree = "<group>"; };
 		CAFE000000000002000000AA /* PacketTunnelProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PacketTunnelProvider.swift; sourceTree = "<group>"; };
 		CAFE000000000003000000AA /* Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		CAFE000000000004000000AA /* PacketTunnel.appex */ = {isa = PBXFileReference; explicitFileType = "wrapper.app-extension"; includeInIndex = 0; path = PacketTunnel.appex; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -178,6 +180,7 @@
 				97C146F11CF9000F007C117D /* Info.plist */,
 				74858FAE1ED2DC5600515810 /* AppDelegate.swift */,
 				CAFE000000000001000000AA /* VpnManager.swift */,
+				CAFE000000000002000000AA /* StatsClient.swift */,
 				CAFE000000000005000000AA /* Runner.entitlements */,
 				1498D2311E8E86230040F4C2 /* GeneratedPluginRegistrant.m */,
 				1771E259F7494EBC8BB1F97A /* GeneratedPluginRegistrant.h */,
@@ -396,6 +399,7 @@
 			files = (
 				74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */,
 				CAFE000000000001000000AB /* VpnManager.swift in Sources */,
+				CAFE000000000002000000AB /* StatsClient.swift in Sources */,
 				1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;