ADD: added some quiality of life features

prisma/migrations/20260315175158_add_deleted_at_to_invoice/migration.sql

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+-- AlterTable
+ALTER TABLE `invoices` ADD COLUMN `deletedAt` DATETIME(3) NULL;

prisma/migrations/20260315181453_nullable_invoice_number/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE `invoices` MODIFY `number` VARCHAR(191) NULL;

prisma/migrations/20260315182705_add_services/migration.sql

@@ -0,0 +1,17 @@
+-- CreateTable
+CREATE TABLE `services` (
+    `id` VARCHAR(191) NOT NULL,
+    `companyId` VARCHAR(191) NOT NULL,
+    `name` VARCHAR(191) NOT NULL,
+    `description` TEXT NULL,
+    `unit` VARCHAR(191) NULL,
+    `unitPrice` DECIMAL(10, 2) NOT NULL,
+    `taxRate` DECIMAL(5, 2) NOT NULL,
+    `createdAt` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    `updatedAt` DATETIME(3) NOT NULL,
+
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- AddForeignKey
+ALTER TABLE `services` ADD CONSTRAINT `services_companyId_fkey` FOREIGN KEY (`companyId`) REFERENCES `companies`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;