Feat: Agregar opcion para eliminar chats completamente

- Crear endpoint DELETE /api/messages/:instanceId/:chatId
- Agregar boton de eliminar en ChatItem
- Crear modal de confirmacion con advertencia
- Elimina el chat y todos los mensajes relacionados (CASCADE)
- Muestra cantidad de mensajes eliminados en notificacion

server/api/messages/[instanceId]/[chatId]/index.delete.ts

@@ -0,0 +1,72 @@
+/**
+ * DELETE /api/messages/:instanceId/:chatId
+ * Delete a chat and all its related data (messages, etc.)
+ */
+import { query } from '../../../../utils/database'
+
+export default defineEventHandler(async (event) => {
+  const username = getHeader(event, 'x-authentik-username')
+  if (!username) {
+    throw createError({ statusCode: 401, message: 'Unauthorized' })
+  }
+
+  const instanceId = getRouterParam(event, 'instanceId')
+  const chatId = getRouterParam(event, 'chatId')
+
+  if (!instanceId) {
+    throw createError({ statusCode: 400, message: 'Missing instanceId' })
+  }
+
+  if (!chatId) {
+    throw createError({ statusCode: 400, message: 'Missing chatId' })
+  }
+
+  try {
+    // First, get chat info for logging
+    const chatResult = await query(
+      `SELECT id, jid, name, alias FROM chats WHERE id = $1 AND instance_id = $2`,
+      [chatId, instanceId]
+    )
+
+    if (chatResult.rows.length === 0) {
+      throw createError({ statusCode: 404, message: 'Chat not found' })
+    }
+
+    const chat = chatResult.rows[0]
+
+    // Count messages that will be deleted
+    const messageCount = await query(
+      `SELECT COUNT(*) as count FROM messages WHERE chat_id = $1`,
+      [chatId]
+    )
+
+    // Delete the chat (messages will be deleted via CASCADE)
+    await query(
+      `DELETE FROM chats WHERE id = $1 AND instance_id = $2`,
+      [chatId, instanceId]
+    )
+
+    console.log(`[Chat API] Deleted chat ${chat.jid} (${chat.name || chat.alias || 'unnamed'}) with ${messageCount.rows[0].count} messages`)
+
+    return {
+      success: true,
+      deleted: {
+        chatId: chat.id,
+        jid: chat.jid,
+        name: chat.name || chat.alias,
+        messagesDeleted: parseInt(messageCount.rows[0].count)
+      }
+    }
+  } catch (error: any) {
+    console.error('[Chat API] Error deleting chat:', error)
+
+    if (error.statusCode) {
+      throw error
+    }
+
+    throw createError({
+      statusCode: 500,
+      message: error.message || 'Error deleting chat'
+    })
+  }
+})