style: clean up code formatting and remove trailing whitespace

refactor: reorganize imports and fix type imports

lib/mongodb/models/Chat.ts

@@ -2,7 +2,7 @@
  * Model Chat - Representa uma conversa entre comprador e vendedor
  */
 
-import mongoose, { Schema, model, models } from "mongoose";
+import { model, models, Schema } from "mongoose";
 
 export interface IChat {
   chat_id: string; // ID único: `${listing_id}_${buyer_id}_${seller_id}`
@@ -16,7 +16,7 @@ export interface IChat {
   buyer_unread_count: number;
   seller_unread_count: number;
   is_active: boolean; // Chat ativo (anúncio ainda disponível)
-  
+
   // Dados cached do anúncio (para performance)
   listing_cache: {
     item_name: string;
@@ -27,14 +27,14 @@ export interface IChat {
     server_name: string;
     listing_status: string;
   };
-  
+
   // Dados cached dos usuários
   buyer_cache: {
     user_id: number;
     username: string;
     character_name?: string;
   };
-  
+
   seller_cache: {
     user_id: number;
     username: string;
@@ -120,7 +120,7 @@ const ChatSchema = new Schema<IChat>(
   {
     timestamps: false, // Usamos campos manuais
     collection: "chats",
-  }
+  },
 );
 
 // Índices compostos para queries eficientes
@@ -135,4 +135,3 @@ ChatSchema.pre("save", function (next) {
 });
 
 export const Chat = models.Chat || model<IChat>("Chat", ChatSchema);
-