中文化所有页面 UI 文本

- index.html: 中文化设备操作、任务队列相关文本
- video-learning.html: 中文化会话创建、控制、状态显示等所有文本

Changes:
- placeholder "Enter task..." → "输入任务..."
- button "Execute" → "执行"
- button "Running..." → "运行中..."
- section "Task Queue" → "任务队列"
- section "Devices" → "设备"
- title "Video Learning" → "视频学习"
- form labels: "Device" → "设备", "Platform" → "平台", etc.
- button "Start Learning" → "开始学习"
- session controls: "Resume" → "恢复", "Pause" → "暂停", "Stop" → "停止"
- toast messages: all converted to Chinese
- empty states: "No devices found" → "未找到设备", etc.

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

dashboard/static/index.html

@@ -110,7 +110,7 @@
                             <input
                                 v-model="device.taskInput"
                                 type="text"
-                                placeholder="Enter task..."
+                                placeholder="输入任务..."
                                 @keyup.enter="executeTask(device)"
                                 :disabled="device.status === 'busy' || !device.is_connected"
                             >
@@ -119,7 +119,7 @@
                                 class="btn btn-primary"
                                 :disabled="device.status === 'busy' || !device.is_connected || !device.taskInput"
                             >
-                                {{ device.status === 'busy' ? 'Running...' : 'Execute' }}
+                                {{ device.status === 'busy' ? '运行中...' : '执行' }}
                             </button>
                         </div>
                     </div>
@@ -129,14 +129,14 @@
                         <rect x="5" y="2" width="14" height="20" rx="2" ry="2"></rect>
                         <line x1="12" y1="18" x2="12" y2="18"></line>
                     </svg>
-                    <p>No devices found</p>
-                    <button @click="refreshDevices" class="btn btn-secondary">Scan for Devices</button>
+                    <p>未找到设备</p>
+                    <button @click="refreshDevices" class="btn btn-secondary">扫描设备</button>
                 </div>
             </section>
 
             <!-- Task Queue -->
             <section class="tasks-section">
-                <h2>Task Queue</h2>
+                <h2>任务队列</h2>
                 <div class="task-list" v-if="tasks.length > 0">
                     <div
                         class="task-item"
@@ -151,8 +151,8 @@
                             </div>
                             <p class="task-description">{{ task.task }}</p>
                             <div class="task-meta">
-                                <span>Device: {{ task.device_id }}</span>
-                                <span>Step: {{ task.current_step }}/{{ task.max_steps }}</span>
+                                <span>设备：{{ task.device_id }}</span>
+                                <span>步数：{{ task.current_step }}/{{ task.max_steps }}</span>
                             </div>
                             <div class="task-progress" v-if="task.status === 'running'">
                                 <div class="progress-bar" :style="{ width: (task.current_step / task.max_steps * 100) + '%' }"></div>
@@ -192,7 +192,7 @@
                                 <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                                     <rect x="6" y="6" width="12" height="12"></rect>
                                 </svg>
-                                Stop
+                                停止
                             </button>
                         </div>
                         <div class="task-actions" v-else>
@@ -202,7 +202,7 @@
                                     <polyline points="1 20 1 14 7 14"></polyline>
                                     <path d="M3.51 9a9 9 0 0 1 14.85-3.36L23 10M1 14l4.64 4.36A9 9 0 0 0 20.49 15"></path>
                                 </svg>
-                                Re-execute
+                                重新执行
                             </button>
                         </div>
                     </div>
@@ -211,8 +211,8 @@
                     <svg width="64" height="64" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1">
                         <polyline points="22 12 18 12 15 21 9 3 6 12 2 12"></polyline>
                     </svg>
-                    <p>No tasks yet</p>
-                    <p class="hint">Enter a task above to get started</p>
+                    <p>暂无任务</p>
+                    <p class="hint">在上方输入任务开始使用</p>
                 </div>
             </section>
         </main>