feat: 完善 USB UVC 设备异常处理，添加 USB 设备复位功能

src/web/handlers/devices.rs

@@ -3,8 +3,11 @@
 //! Provides API endpoints for discovering available hardware devices.
 
 use axum::Json;
+use serde::Deserialize;
 
 use crate::atx::{discover_devices, AtxDevices};
+use crate::error::{AppError, Result};
+use crate::video::usb_reset;
 
 /// GET /api/devices/atx - List available ATX devices
 ///
@@ -12,3 +15,35 @@ use crate::atx::{discover_devices, AtxDevices};
 pub async fn list_atx_devices() -> Json<AtxDevices> {
     Json(discover_devices())
 }
+
+/// GET /api/devices/usb - List all USB devices
+///
+/// Enumerates USB devices from `/sys/bus/usb/devices/` with associated
+/// video device mappings.
+pub async fn list_usb_devices() -> Json<Vec<usb_reset::UsbDeviceInfo>> {
+    Json(usb_reset::list_usb_devices())
+}
+
+#[derive(Deserialize)]
+pub struct UsbResetRequest {
+    pub bus_num: u32,
+    pub dev_num: u32,
+}
+
+/// POST /api/devices/usb/reset - Reset a USB device via authorized cycle
+///
+/// Writes `0` then `1` to the device's `authorized` sysfs attribute,
+/// causing the kernel to deauthorize and re-authorize the device.
+/// Requires root or write access to sysfs.
+pub async fn reset_usb_device(Json(req): Json<UsbResetRequest>) -> Result<Json<serde_json::Value>> {
+    usb_reset::reset_usb_device(req.bus_num, req.dev_num).map_err(|e| {
+        AppError::VideoError(format!(
+            "USB reset failed for device {}-{}: {}",
+            req.bus_num, req.dev_num, e
+        ))
+    })?;
+    Ok(Json(serde_json::json!({
+        "success": true,
+        "message": format!("USB device {}-{} reset successfully", req.bus_num, req.dev_num)
+    })))
+}