fix(room): accept room_public JSON key for HTTP fallback

The frontend WebSocket client sends room_public, but the HTTP fallback
sends it as a JSON body parsed directly into RoomCreateRequest/RoomUpdateRequest
which expects public. Add #[serde(rename = "room_public")] so both
ws params and HTTP JSON body work consistently.

libs/room/src/types.rs

@@ -113,6 +113,7 @@ pub struct RoomCategoryResponse {
 #[derive(Debug, Clone, Deserialize, Serialize, utoipa::ToSchema)]
 pub struct RoomCreateRequest {
     pub room_name: String,
+    #[serde(rename = "room_public")]
     pub public: bool,
     pub category: Option<Uuid>,
 }
@@ -120,6 +121,7 @@ pub struct RoomCreateRequest {
 #[derive(Debug, Clone, Deserialize, Serialize, utoipa::ToSchema)]
 pub struct RoomUpdateRequest {
     pub room_name: Option<String>,
+    #[serde(rename = "room_public")]
     pub public: Option<bool>,
     pub category: Option<Uuid>,
 }