demo app + SDK updates:\n- Add direct ANI transfer (prepare -> transfer)\n- Add firmware update flow (fetch latest w/ x-api-key, OTA transfer)\n- Extract x-api-key to NetworkConstants\n- Rename example app to demo; move folder and entry to DemoApp\n- Switch from SPM package dependency to local framework target\n- Enable automatic Info.plist generation for framework target\n- Add placeholder test to satisfy SwiftPM test target\n- Regenerate XcodeGen project (demo.xcodeproj)

demo/Sources/AniConverter.swift

@@ -0,0 +1,84 @@
+import Foundation
+
+/// ANI 转换接口错误。
+struct AniConverterError: LocalizedError {
+    let message: String
+    var errorDescription: String? { message }
+}
+
+/// 将源视频转换为设备可用的 ANI 文件。
+///
+/// 接口定义详见 duooomi-ble-sdk/CLAUDE.md 的"外部依赖 > ANI 转换 API"。
+/// 除 `videoUrl` 外，`width / height / fps` 全部固定写死，不得暴露为可调参数。
+enum AniConverter {
+    private static let endpoint = URL(string: "https://api.mixvideo.bowong.cc/api/auth/loomart/file/convert-to-ani")!
+
+    /// 专用 session：延长超时，避免 ANI 转换耗时长被空闲连接关闭（-1005）。
+    private static let session: URLSession = {
+        let config = URLSessionConfiguration.default
+        config.timeoutIntervalForRequest = 120
+        config.timeoutIntervalForResource = 180
+        config.waitsForConnectivity = true
+        return URLSession(configuration: config)
+    }()
+
+    /// 调用 ANI 转换接口，返回 ani 文件的 CDN URL。
+    /// - Parameter videoUrl: 源视频的公网 URL。
+    /// - Returns: 转换后 ani 文件的 CDN URL。
+    /// - Throws: 网络异常、服务返回失败或响应解析失败等错误。
+    /// - Note: 遇到 -1005（连接丢失）时自动重试一次。
+    static func convert(videoUrl: String) async throws -> String {
+        do {
+            return try await performConvert(videoUrl: videoUrl)
+        } catch let error as NSError where error.code == NSURLErrorNetworkConnectionLost {
+            // -1005 重试一次
+            return try await performConvert(videoUrl: videoUrl)
+        }
+    }
+
+    /// 实际执行转换请求。
+    /// - Parameter videoUrl: 源视频 URL。
+    /// - Returns: ani 文件 URL。
+    /// - Throws: 各类网络或业务错误。
+    private static func performConvert(videoUrl: String) async throws -> String {
+        var request = URLRequest(url: endpoint)
+        request.httpMethod = "POST"
+        request.setValue("application/json", forHTTPHeaderField: "content-type")
+        request.setValue(NetworkConfig.apiKey, forHTTPHeaderField: "x-api-key")
+        request.timeoutInterval = 120
+
+        let body: [String: Any] = [
+            "videoUrl": videoUrl,
+            "width": 360,
+            "height": 360,
+            "fps": "24",
+        ]
+        request.httpBody = try JSONSerialization.data(withJSONObject: body)
+
+        let (data, response) = try await session.data(for: request)
+
+        if let http = response as? HTTPURLResponse, !(200..<300).contains(http.statusCode) {
+            throw AniConverterError(message: "HTTP \(http.statusCode)")
+        }
+
+        guard let json = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
+            throw AniConverterError(message: "Invalid JSON response")
+        }
+
+        guard (json["success"] as? Bool) == true,
+              let outer = json["data"] as? [String: Any] else {
+            throw AniConverterError(message: "ANI API reported failure")
+        }
+
+        if (outer["status"] as? Bool) != true {
+            let msg = (outer["msg"] as? String) ?? "ANI conversion failed"
+            throw AniConverterError(message: msg)
+        }
+
+        guard let aniUrl = outer["data"] as? String, !aniUrl.isEmpty else {
+            throw AniConverterError(message: "Missing ani url in response")
+        }
+
+        return aniUrl
+    }
+}