Handle WebSocket session removal on channel closure

Add `removeSession` calls in WebSocket exception handling blocks to ensure proper session cleanup when a `ClosedReceiveChannelException` occurs. Prevents potential resource leaks and ensures consistency across WebSocket routes.

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/WSSongListRoutes.kt

@@ -151,6 +151,7 @@ fun Routing.wsSongListRoutes() {
             }
         } catch (e: ClosedReceiveChannelException) {
             logger.error("Error in WebSocket: ${e.message}")
+            removeSession(uid)
         }
     }
 

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/WSSongRoutes.kt

@@ -110,6 +110,7 @@ fun Routing.wsSongRoutes() {
             }
         } catch(e: ClosedReceiveChannelException) {
             logger.error("Error in WebSocket: ${e.message}")
+            removeSession(uid, this)
         }
     }
 

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/WSTimerRoutes.kt

@@ -87,6 +87,7 @@ fun Routing.wsTimerRoutes() {
             }
         } catch(e: ClosedReceiveChannelException) {
             logger.error("Error in WebSocket: ${e.message}")
+            removeSession(uid, this)
         }
     }