初步完成框架

- 实时图传：WebSocket JPEG 帧发送 + 帧率控制 + PC 浏览器预览
- PDF 上传与处理：上传/处理分离，支持 ocrpdf 和 markdown 两种类型
- MinerU 真实接入：markdown 处理 + images ZIP 打包
- OCRmyPDF 接入：ocrpdf 生成可搜索双层 PDF
- 手机端任务管理面板：轮询状态 + SAF 目录选择下载
- PC 管理面板：/dashboard 文件与任务管理
- 网络层：OkHttp 客户端、WebSocket 图传、局域网发现占位

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gradle/libs.versions.toml

@@ -23,6 +23,7 @@ kotlinSerialization = "1.10.0"
 reorderable = "3.0.0"
 jetbrainsKotlinJvm = "2.3.10"
 coroutines-test = "1.10.2"
+okhttp = "4.12.0"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -63,6 +64,7 @@ kotlinx-coroutines-test = { group = "org.jetbrains.kotlinx", name = "kotlinx-cor
 
 
 assertj =  { group="org.assertj", name="assertj-core", version.ref = "assertj" }
+okhttp = { group = "com.squareup.okhttp3", name = "okhttp", version.ref = "okhttp" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }