feat(video): 事务化切换与前端统一编排，增强视频输入格式支持

- 后端：切换事务+transition_id，/stream/mode 返回 switching/transition_id 与实际 codec

- 事件：新增 mode_switching/mode_ready，config/webrtc_ready/mode_changed 关联事务

- 编码/格式：扩展 NV21/NV16/NV24/RGB/BGR 输入与转换链路，RKMPP direct input 优化

- 前端：useVideoSession 统一切换，失败回退真实切回 MJPEG，菜单格式同步修复

- 清理：useVideoStream 降级为 MJPEG-only

src/atx/led.rs

@@ -55,7 +55,10 @@ impl LedSensor {
             .map_err(|e| AppError::Internal(format!("LED GPIO chip failed: {}", e)))?;
 
         let line = chip.get_line(self.config.gpio_pin).map_err(|e| {
-            AppError::Internal(format!("LED GPIO line {} failed: {}", self.config.gpio_pin, e))
+            AppError::Internal(format!(
+                "LED GPIO line {} failed: {}",
+                self.config.gpio_pin, e
+            ))
         })?;
 
         let handle = line

src/atx/mod.rs

@@ -52,8 +52,8 @@ mod wol;
 pub use controller::{AtxController, AtxControllerConfig};
 pub use executor::timing;
 pub use types::{
-    ActiveLevel, AtxAction, AtxDevices, AtxDriverType, AtxKeyConfig, AtxLedConfig,
-    AtxPowerRequest, AtxState, PowerStatus,
+    ActiveLevel, AtxAction, AtxDevices, AtxDriverType, AtxKeyConfig, AtxLedConfig, AtxPowerRequest,
+    AtxState, PowerStatus,
 };
 pub use wol::send_wol;
 

src/atx/wol.rs

@@ -22,7 +22,10 @@ fn parse_mac_address(mac: &str) -> Result<[u8; 6]> {
     } else if mac.contains('-') {
         mac.split('-').collect()
     } else {
-        return Err(AppError::Config(format!("Invalid MAC address format: {}", mac)));
+        return Err(AppError::Config(format!(
+            "Invalid MAC address format: {}",
+            mac
+        )));
     };
 
     if parts.len() != 6 {
@@ -34,9 +37,8 @@ fn parse_mac_address(mac: &str) -> Result<[u8; 6]> {
 
     let mut bytes = [0u8; 6];
     for (i, part) in parts.iter().enumerate() {
-        bytes[i] = u8::from_str_radix(part, 16).map_err(|_| {
-            AppError::Config(format!("Invalid MAC address byte: {}", part))
-        })?;
+        bytes[i] = u8::from_str_radix(part, 16)
+            .map_err(|_| AppError::Config(format!("Invalid MAC address byte: {}", part)))?;
     }
 
     Ok(bytes)