refactor: 优化配置管理和异常处理

- 添加YAML配置文件支持
- 改进camera_manager异常处理
- 添加类型提示和URL验证
- 完善依赖注入支持测试
- 新增健康检查API端点

app/templates/index.html

@@ -33,7 +33,8 @@
             </div>
             <div class="camera-controls-combined" id="controls-{{ camera.id }}">
                 <button class="cam-btn" onclick="refreshCamera({{ camera.id }})">刷新</button>
-                <button class="cam-btn cam-btn-fullscreen" onclick="toggleFullscreen({{ camera.id }})">全屏</button>
+                <button class="cam-btn cam-btn-fullscreen" id="fullscreen-btn-{{ camera.id }}" onclick="toggleFullscreen({{ camera.id }})">全屏</button>
+                <button class="cam-btn cam-btn-exit-fullscreen" id="exit-fullscreen-btn-{{ camera.id }}" onclick="toggleFullscreen({{ camera.id }})" style="display: none;">退出全屏</button>
                 <button class="selector-btn active" onclick="switchCameraNumber(event, {{ camera.id }}, 'mixed')">混合</button>
                 <button class="selector-btn" onclick="switchCameraNumber(event, {{ camera.id }}, 0)">0</button>
                 <button class="selector-btn" onclick="switchCameraNumber(event, {{ camera.id }}, 1)">1</button>