Refactor database migrations and schema for Chat and Setting tables

- Removed the unique constraint on `remoteJid` and `instanceId` in the `Chat` model to prevent potential migration failures due to existing duplicates.
- Deleted the old migration file for adding `wavoipToken` to the `Setting` table and created a new migration that includes a check for the column's existence before adding it, ensuring smoother migration processes.
- Updated migration logic to clear previous migrations related to `wavoip_token` to maintain a clean migration history.

prisma/postgresql-migrations/20250116001415_add_wavoip_token_to_settings_table/migration.sql

@@ -0,0 +1,21 @@
+/*
+Warnings:
+
+- A unique constraint covering the columns `[remoteJid,instanceId]` on the table `Chat` will be added. If there are existing duplicate values, this will fail.
+
+*/
+
+-- Clear migrations
+DELETE FROM "_prisma_migrations" WHERE "migration_name" LIKE '%_add_wavoip_token_to_settings_table';
+-- AlterTable
+DO $$ 
+BEGIN 
+    IF NOT EXISTS (
+        SELECT 1
+        FROM information_schema.columns
+        WHERE table_name = 'Setting'
+        AND column_name = 'wavoipToken'
+    ) THEN
+        ALTER TABLE "Setting" ADD COLUMN "wavoipToken" VARCHAR(100);
+    END IF;
+END $$;