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/config/schema.rs

@@ -1,6 +1,6 @@
+use crate::video::encoder::BitratePreset;
 use serde::{Deserialize, Serialize};
 use typeshare::typeshare;
-use crate::video::encoder::BitratePreset;
 
 // Re-export ExtensionsConfig from extensions module
 pub use crate::extensions::ExtensionsConfig;
@@ -147,8 +147,8 @@ pub struct OtgDescriptorConfig {
 impl Default for OtgDescriptorConfig {
     fn default() -> Self {
         Self {
-            vendor_id: 0x1d6b,      // Linux Foundation
-            product_id: 0x0104,     // Multifunction Composite Gadget
+            vendor_id: 0x1d6b,  // Linux Foundation
+            product_id: 0x0104, // Multifunction Composite Gadget
             manufacturer: "One-KVM".to_string(),
             product: "One-KVM USB Device".to_string(),
             serial_number: None,
@@ -425,8 +425,15 @@ impl StreamConfig {
     /// Check if using public ICE servers (user left fields empty)
     pub fn is_using_public_ice_servers(&self) -> bool {
         use crate::webrtc::config::public_ice;
-        self.stun_server.as_ref().map(|s| s.is_empty()).unwrap_or(true)
-            && self.turn_server.as_ref().map(|s| s.is_empty()).unwrap_or(true)
+        self.stun_server
+            .as_ref()
+            .map(|s| s.is_empty())
+            .unwrap_or(true)
+            && self
+                .turn_server
+                .as_ref()
+                .map(|s| s.is_empty())
+                .unwrap_or(true)
             && public_ice::is_configured()
     }
 }

src/config/store.rs

@@ -126,11 +126,10 @@ impl ConfigStore {
 
     /// Load configuration from database
     async fn load_config(pool: &Pool<Sqlite>) -> Result<AppConfig> {
-        let row: Option<(String,)> = sqlx::query_as(
-            "SELECT value FROM config WHERE key = 'app_config'"
-        )
-        .fetch_optional(pool)
-        .await?;
+        let row: Option<(String,)> =
+            sqlx::query_as("SELECT value FROM config WHERE key = 'app_config'")
+                .fetch_optional(pool)
+                .await?;
 
         match row {
             Some((json,)) => {
@@ -245,10 +244,13 @@ mod tests {
         assert!(!config.initialized);
 
         // Update config
-        store.update(|c| {
-            c.initialized = true;
-            c.web.http_port = 9000;
-        }).await.unwrap();
+        store
+            .update(|c| {
+                c.initialized = true;
+                c.web.http_port = 9000;
+            })
+            .await
+            .unwrap();
 
         // Verify update
         let config = store.get();