feat: bulk send templates via csv (#1578)

Implements a bulk send feature allowing users to upload a CSV file to
create multiple documents from a template. Includes CSV template
generation, background processing, and email notifications.

<img width="563" alt="image"
src="https://github.com/user-attachments/assets/658cee71-6508-4a00-87da-b17c6762b7d8"
/>
<img width="578" alt="image"
src="https://github.com/user-attachments/assets/bbfac70b-c6a0-466a-be98-99ca4c4eb1b9"
/>
<img width="635" alt="image"
src="https://github.com/user-attachments/assets/65b2f55d-d491-45ac-84d6-1a31afe953dd"
/>


## Changes Made

- Added `TemplateBulkSendDialog` with CSV upload/download functionality
- Implemented bulk send job handler using background task system
- Created email template for completion notifications
- Added bulk send option to template view and actions dropdown
- Added CSV parsing with email/name validation

## Testing Performed

- CSV upload with valid/invalid data
- Bulk send with/without immediate sending
- Email notifications and error handling
- Team context integration
- File size and row count limits

Resolves #1550

packages/lib/jobs/definitions/internal/bulk-send-template.ts

@@ -0,0 +1,37 @@
+import { z } from 'zod';
+
+import { ZRequestMetadataSchema } from '../../../universal/extract-request-metadata';
+import { type JobDefinition } from '../../client/_internal/job';
+
+const BULK_SEND_TEMPLATE_JOB_DEFINITION_ID = 'internal.bulk-send-template';
+
+const BULK_SEND_TEMPLATE_JOB_DEFINITION_SCHEMA = z.object({
+  userId: z.number(),
+  teamId: z.number().optional(),
+  templateId: z.number(),
+  csvContent: z.string(),
+  sendImmediately: z.boolean(),
+  requestMetadata: ZRequestMetadataSchema.optional(),
+});
+
+export type TBulkSendTemplateJobDefinition = z.infer<
+  typeof BULK_SEND_TEMPLATE_JOB_DEFINITION_SCHEMA
+>;
+
+export const BULK_SEND_TEMPLATE_JOB_DEFINITION = {
+  id: BULK_SEND_TEMPLATE_JOB_DEFINITION_ID,
+  name: 'Bulk Send Template',
+  version: '1.0.0',
+  trigger: {
+    name: BULK_SEND_TEMPLATE_JOB_DEFINITION_ID,
+    schema: BULK_SEND_TEMPLATE_JOB_DEFINITION_SCHEMA,
+  },
+  handler: async ({ payload, io }) => {
+    const handler = await import('./bulk-send-template.handler');
+
+    await handler.run({ payload, io });
+  },
+} as const satisfies JobDefinition<
+  typeof BULK_SEND_TEMPLATE_JOB_DEFINITION_ID,
+  TBulkSendTemplateJobDefinition
+>;