feat(device): 添加USB设备通信支持和程序参数优化

- 在AndroidManifest.xml中添加USB Host权限和设备过滤器配置
- 新增设备控制国际化词条包括速度档位、吹气时间等
- 重构数据库结构将速度相关字段统一为档位数值存储
- 添加通用KV存储方法用于settings表数据读写
- 优化首页导航实现tab间跳转和状态保持功能
- 更新程序详情页面布局和参数表单界面
- 移除模拟运行器相关测试代码
- 添加USB串口通信依赖包usb_serial

lib/features/program_detail/widgets/step_form.dart

@@ -34,9 +34,7 @@ class _StepFormState extends State<StepForm> {
   late TextEditingController _blowTimeController;
 
   String _position = 'A1';
-  String _mixSpeed = '中速';
-  String _blowSpeed = '中速';
-  int _needleSpeed = 5;
+  int _speed = 5;
 
   @override
   void initState() {
@@ -48,9 +46,7 @@ class _StepFormState extends State<StepForm> {
     _blowTimeController = TextEditingController(text: '${widget.step?.blowTime ?? 0}');
 
     _position = widget.step?.position ?? 'A1';
-    _mixSpeed = widget.step?.mixSpeed ?? '中速';
-    _blowSpeed = widget.step?.blowSpeed ?? '中速';
-    _needleSpeed = widget.step?.needleSpeed ?? 5;
+    _speed = widget.step?.speed ?? 5;
   }
 
   @override
@@ -179,53 +175,22 @@ class _StepFormState extends State<StepForm> {
             ),
             const SizedBox(height: 16),
 
-            // 速度选择
-            Row(
-              children: [
-                Expanded(
-                  child: DropdownButtonFormField<String>(
-                    value: _mixSpeed,
-                    decoration: InputDecoration(
-                      labelText: l10n?.mixSpeed ?? '混合速度',
-                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
-                    ),
-                    items: Constants.speedOptions.map((s) => DropdownMenuItem(value: s, child: Text(s))).toList(),
-                    onChanged: (value) {
-                      if (value != null) setState(() => _mixSpeed = value);
-                    },
-                  ),
-                ),
-                const SizedBox(width: 16),
-                Expanded(
-                  child: DropdownButtonFormField<String>(
-                    value: _blowSpeed,
-                    decoration: InputDecoration(
-                      labelText: l10n?.blowSpeed ?? '吹气速度',
-                      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
-                    ),
-                    items: Constants.speedOptions.map((s) => DropdownMenuItem(value: s, child: Text(s))).toList(),
-                    onChanged: (value) {
-                      if (value != null) setState(() => _blowSpeed = value);
-                    },
-                  ),
-                ),
-              ],
-            ),
-            const SizedBox(height: 16),
-
-            // 下针速度滑块
+            // 速度滑块
             Column(
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
-                Text('${l10n?.needleSpeed ?? '下针速度'}: $_needleSpeed 档', style: TextStyle(color: AppTheme.textPrimary)),
+                Text(
+                  '${l10n?.speed ?? '速度'}: $_speed 档',
+                  style: TextStyle(color: AppTheme.textPrimary),
+                ),
                 Slider(
-                  value: _needleSpeed.toDouble(),
+                  value: _speed.toDouble(),
                   min: 1,
                   max: 10,
                   divisions: 9,
                   activeColor: AppTheme.primaryColor,
                   onChanged: (value) {
-                    setState(() => _needleSpeed = value.round());
+                    setState(() => _speed = value.round());
                   },
                 ),
               ],
@@ -259,10 +224,8 @@ class _StepFormState extends State<StepForm> {
       mixTime: int.tryParse(_mixTimeController.text) ?? 0,
       magnetTime: int.tryParse(_magnetTimeController.text) ?? 0,
       volume: int.tryParse(_volumeController.text) ?? 0,
-      mixSpeed: _mixSpeed,
-      blowSpeed: _blowSpeed,
       blowTime: int.tryParse(_blowTimeController.text) ?? 0,
-      needleSpeed: _needleSpeed,
+      speed: _speed,
     );
 
     widget.onSave(step);