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/trpc/server/template-router/schema.ts

@@ -188,6 +188,14 @@ export const ZMoveTemplateToTeamRequestSchema = z.object({
 
 export const ZMoveTemplateToTeamResponseSchema = ZTemplateLiteSchema;
 
+export const ZBulkSendTemplateMutationSchema = z.object({
+  templateId: z.number(),
+  teamId: z.number().optional(),
+  csv: z.string().min(1),
+  sendImmediately: z.boolean(),
+});
+
 export type TCreateTemplateMutationSchema = z.infer<typeof ZCreateTemplateMutationSchema>;
 export type TDuplicateTemplateMutationSchema = z.infer<typeof ZDuplicateTemplateMutationSchema>;
 export type TDeleteTemplateMutationSchema = z.infer<typeof ZDeleteTemplateMutationSchema>;
+export type TBulkSendTemplateMutationSchema = z.infer<typeof ZBulkSendTemplateMutationSchema>;