搭建代码框架并更新文档

docs/API.md

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+# DisplayFlow API 文档
+
+本文档描述 DisplayFlow 的核心 API。
+
+## 1. 核心 API
+
+### 1.1 会话管理
+
+```cpp
+class SessionManager {
+public:
+    std::shared_ptr<Session> CreateSession(RoleType role);
+    void DestroySession(SessionId sessionId);
+    std::shared_ptr<Session> GetSession(SessionId sessionId);
+};
+```
+
+### 1.2 角色管理
+
+```cpp
+class RoleManager {
+public:
+    bool RegisterRole(RoleType type, std::shared_ptr<IRole> role);
+    bool SwitchRole(SessionId sessionId, RoleType newRole);
+};
+```
+
+### 1.3 网络管理
+
+```cpp
+class NetworkManager {
+public:
+    bool Initialize();
+    std::vector<NetworkInterface> GetAvailableInterfaces();
+    bool Connect(const NetworkInterface& interface);
+    void Disconnect();
+};
+```
+
+## 2. 平台 API
+
+### 2.1 Android
+
+```cpp
+class AndroidPlatformAdapter {
+public:
+    bool Initialize();
+    bool StartScreenCapture();
+    void StopScreenCapture();
+    void SetFrameCallback(FrameCallback callback);
+};
+```
+
+### 2.2 Windows
+
+```cpp
+class WindowsPlatformAdapter {
+public:
+    bool Initialize();
+    bool CreateVirtualDisplay(const Resolution& resolution);
+    void DestroyVirtualDisplay();
+    bool RenderFrame(const VideoFrame& frame);
+};
+```
+
+## 3. 使用示例
+
+### 3.1 创建 Host 会话
+
+```cpp
+auto sessionManager = std::make_shared<SessionManager>();
+auto session = sessionManager->CreateSession(RoleType::Host);
+auto hostRole = std::make_shared<HostRole>();
+hostRole->Start(session);
+```
+
+### 3.2 创建 Client 会话
+
+```cpp
+auto sessionManager = std::make_shared<SessionManager>();
+auto session = sessionManager->CreateSession(RoleType::Client);
+auto clientRole = std::make_shared<ClientRole>();
+clientRole->Start(session);
+```
+