style: clean up code formatting and remove trailing whitespace

refactor: reorganize imports and fix type imports

lib/mongodb/connection.ts

@@ -3,7 +3,7 @@
  * Singleton pattern para reutilizar conexão
  */
 
-import mongoose from "mongoose";
+import type mongoose from "mongoose";
 
 function getMongoUrl(): string {
   const url = process.env.MONGO_URL;
@@ -24,7 +24,7 @@ declare global {
   var mongoose: MongooseCache | undefined;
 }
 
-let cached: MongooseCache = global.mongoose || { conn: null, promise: null };
+const cached: MongooseCache = global.mongoose || { conn: null, promise: null };
 
 if (!global.mongoose) {
   global.mongoose = cached;
@@ -79,4 +79,3 @@ export async function disconnectMongoDB(): Promise<void> {
     cached.promise = null;
   }
 }
-

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);
-

lib/mongodb/models/Message.ts

@@ -2,7 +2,7 @@
  * Model Message - Representa uma mensagem em um chat
  */
 
-import mongoose, { Schema, model, models } from "mongoose";
+import { model, models, Schema } from "mongoose";
 
 export interface IMessage {
   chat_id: string; // Referência ao chat
@@ -12,7 +12,7 @@ export interface IMessage {
   read_at: Date | null; // Quando foi lida
   edited_at: Date | null; // Se foi editada
   deleted_at: Date | null; // Soft delete
-  
+
   // Metadados
   message_type: "text" | "system"; // System para mensagens automáticas
   metadata?: {
@@ -69,7 +69,7 @@ const MessageSchema = new Schema<IMessage>(
   {
     timestamps: false, // Usamos campos manuais
     collection: "messages",
-  }
+  },
 );
 
 // Índices compostos para queries eficientes
@@ -77,5 +77,5 @@ MessageSchema.index({ chat_id: 1, created_at: -1 }); // Para buscar mensagens de
 MessageSchema.index({ chat_id: 1, sender_id: 1, created_at: -1 });
 MessageSchema.index({ sender_id: 1, created_at: -1 });
 
-export const Message = models.Message || model<IMessage>("Message", MessageSchema);
-
+export const Message =
+  models.Message || model<IMessage>("Message", MessageSchema);