feat(sdk): 帧间隔 frameIntervalMs 配置化（默认 35ms，[0,500] clamp）

DuooomiBleConfig 新增 frameIntervalMs，BleProtocolService 构造期注入。
顺手清死代码 FrameConstants.frameIntervalNanos、修 sendFrames 0.035 字面量
（统一走 config）。demo 加可调输入框 + UserDefaults 持久化。
越界 warn 不抛错，使用点 min/max 兜底。

设计稿：docs/superpowers/specs/2026-05-20-frame-interval-config-design.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Sources/DuooomiBleSDK/DuooomiBleConfig.swift

@@ -18,6 +18,9 @@ public struct DuooomiBleConfig {
     public let aniFps: String
     /// 扫描时按设备蓝牙广播名前缀过滤（大小写不敏感）。**必填**，由集成方约定固件广播名前缀。
     public let scanNamePrefix: String
+    /// 协议帧之间的发送间隔（毫秒）。合法区间 `[0, 500]`，越界仅 warn，使用点会 clamp。
+    /// 集成方一般无需调整；调高用于排查接收端丢帧/拥塞。默认 35。
+    public let frameIntervalMs: Int
 
     public init(
         apiHost: URL = URL(string: "https://api.duooomi.com")!,
@@ -27,7 +30,8 @@ public struct DuooomiBleConfig {
         aniWidth: Int = 360,
         aniHeight: Int = 360,
         aniFps: String = "24",
-        scanNamePrefix: String
+        scanNamePrefix: String,
+        frameIntervalMs: Int = 35
     ) {
         self.apiHost = apiHost
         self.apiKey = apiKey
@@ -37,5 +41,9 @@ public struct DuooomiBleConfig {
         self.aniHeight = aniHeight
         self.aniFps = aniFps
         self.scanNamePrefix = scanNamePrefix
+        if frameIntervalMs < 0 || frameIntervalMs > 500 {
+            BleLog.w("frameIntervalMs=\(frameIntervalMs) out of [0,500], will clamp at use site", "Config")
+        }
+        self.frameIntervalMs = frameIntervalMs
     }
 }

Sources/DuooomiBleSDK/DuooomiBleSDK.swift

@@ -110,7 +110,7 @@ public final class DuooomiBleSDK: NSObject {
     public init(config: DuooomiBleConfig) {
         self.config = config
         bleClient = BleClient()
-        protocolService = BleProtocolService(client: bleClient)
+        protocolService = BleProtocolService(client: bleClient, frameIntervalMs: config.frameIntervalMs)
         timeProvider = BeijingTimeProvider()
         deviceInfoService = DeviceInfoService(protocolService: protocolService, timeProvider: timeProvider)
         fileTransferService = FileTransferService(protocolService: protocolService)

Sources/DuooomiBleSDK/Protocol/ProtocolConstants.swift

@@ -16,8 +16,6 @@ public enum FrameConstants {
     public static let maxDataSize = 496
     public static let headerSize = 8
     public static let footerSize = 1
-    /// Inter-frame delay in nanoseconds (35ms)
-    public static let frameIntervalNanos: UInt64 = 35_000_000
     public static let screenSize = 360
 }
 

Sources/DuooomiBleSDK/Services/BleProtocolService.swift

@@ -10,6 +10,7 @@ final class BleProtocolService: BleClientDelegate {
 
     weak var delegate: BleProtocolServiceDelegate?
     private let client: BleClient
+    private let frameIntervalMs: Int
     private var isListening = false
 
     /// 分包重组会话
@@ -20,9 +21,10 @@ final class BleProtocolService: BleClientDelegate {
 
     private var fragments: [String: FragmentSession] = [:]
 
-    init(client: BleClient) {
+    init(client: BleClient, frameIntervalMs: Int) {
         self.client = client
-        BleLog.i("Protocol service created", "Protocol")
+        self.frameIntervalMs = frameIntervalMs
+        BleLog.i("Protocol service created (frameIntervalMs=\(frameIntervalMs))", "Protocol")
     }
 
     // MARK: - Start/Stop Listening
@@ -90,8 +92,9 @@ final class BleProtocolService: BleClientDelegate {
             onProgress?(Double(index + 1) / Double(total))
 
             if index + 1 < total {
-                // Inter-frame delay 35ms
-                DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: .now() + 0.035) {
+                // Inter-frame delay from config (clamped to [0,500]ms)
+                let delaySec = Double(min(max(self.frameIntervalMs, 0), 500)) / 1000.0
+                DispatchQueue.global(qos: .userInitiated).asyncAfter(deadline: .now() + delaySec) {
                     sendFrame(at: index + 1)
                 }
             } else {

demo/Sources/DemoApp.swift

@@ -29,6 +29,9 @@ final class DemoViewModel: NSObject, ObservableObject, DuooomiBleSDKDelegate {
     @Published var configScanPrefix: String {
         didSet { defaults.set(configScanPrefix, forKey: Self.keyScanPrefix) }
     }
+    @Published var configFrameIntervalMs: String {
+        didSet { defaults.set(configFrameIntervalMs, forKey: Self.keyFrameIntervalMs) }
+    }
 
     // MARK: - SDK State (driven by delegate)
 
@@ -50,26 +53,31 @@ final class DemoViewModel: NSObject, ObservableObject, DuooomiBleSDKDelegate {
     private static let keyBrand = "demo.config.brand"
     private static let keyApiKey = "demo.config.apiKey"
     private static let keyScanPrefix = "demo.config.scanPrefix"
+    private static let keyFrameIntervalMs = "demo.config.frameIntervalMs"
 
     /// demo 调试默认值（仅当 UserDefaults 没存过时使用）。秘钥从 DemoSecrets 读，避免泄露到仓库。
     private static let defaultBrand = DemoSecrets.brand
     private static let defaultApiKey = DemoSecrets.apiKey
     private static let defaultScanPrefix = DemoSecrets.scanNamePrefix
+    private static let defaultFrameIntervalMs = "35"
 
     override init() {
         let d = UserDefaults.standard
         let brand = d.string(forKey: Self.keyBrand) ?? Self.defaultBrand
         let apiKey = d.string(forKey: Self.keyApiKey) ?? Self.defaultApiKey
         let scanPrefix = d.string(forKey: Self.keyScanPrefix) ?? Self.defaultScanPrefix
+        let frameIntervalMs = d.string(forKey: Self.keyFrameIntervalMs) ?? Self.defaultFrameIntervalMs
 
         self.configBrand = brand
         self.configApiKey = apiKey
         self.configScanPrefix = scanPrefix
+        self.configFrameIntervalMs = frameIntervalMs
 
         self.sdk = DuooomiBleSDK(config: .init(
             apiKey: apiKey,
             brand: brand,
-            scanNamePrefix: scanPrefix
+            scanNamePrefix: scanPrefix,
+            frameIntervalMs: Int(frameIntervalMs) ?? 35
         ))
 
         super.init()
@@ -83,7 +91,8 @@ final class DemoViewModel: NSObject, ObservableObject, DuooomiBleSDKDelegate {
         let new = DuooomiBleSDK(config: .init(
             apiKey: configApiKey,
             brand: configBrand,
-            scanNamePrefix: configScanPrefix
+            scanNamePrefix: configScanPrefix,
+            frameIntervalMs: Int(configFrameIntervalMs) ?? 35
         ))
         new.delegate = self
         self.sdk = new

demo/Sources/WrapperTestView.swift

@@ -88,9 +88,15 @@ struct WrapperTestView: View {
                     .autocapitalization(.none)
                     .disableAutocorrection(true)
             }
+            HStack {
+                Text("frameMs").frame(width: 90, alignment: .leading)
+                TextField("35", text: $viewModel.configFrameIntervalMs)
+                    .textFieldStyle(.roundedBorder)
+                    .keyboardType(.numberPad)
+            }
             Button("Reload SDK") {
                 viewModel.reloadSDK()
-                log("SDK reloaded with brand=\(viewModel.configBrand), prefix=\(viewModel.configScanPrefix)", level: .success)
+                log("SDK reloaded with brand=\(viewModel.configBrand), prefix=\(viewModel.configScanPrefix), frameMs=\(viewModel.configFrameIntervalMs)", level: .success)
             }
             .buttonStyle(.borderedProminent)
         }