Modernize MHR Intake & Processing

##Modernize Intake & Processing via the **MHR Application Intake Queue**

### Goal
Provide registry analysts with a single, modern workspace—the **MHR Application Intake Queue**—to intake, validate, triage, and complete all staff-reviewed Manufactured Home Registry submissions. The queue will streamline workflows through automation, decision tracking, collaborative tools, and integrated payment processing, starting with Transfer Upon Death applications and scaling to future Qualified Supplier and permit requests.

### Context
Current MHR staff processes rely on multiple legacy screens, manual data entry, emailed approvals, and disconnected payment steps, resulting in delays and rework. This epic introduces a unified queue that:

* **Auto-populates data** from existing MHR records and trusted external sources to reduce keystrokes and errors.
* **Applies real-time text and format validations** to prevent incomplete or invalid entries from progressing.
* **Supports document management**—analysts can preview, mark reviewed, and upload additional supporting files, all virus-scanned and audit-logged.
* **Enables collaboration and accountability** with internal notes, immutable decision logs, and full audit trails.
* **Facilitates workload management** through clear assignment and re-assignment capabilities.
* **Integrates payment processing** so staff can trigger or complete payments immediately after approval, eliminating Finance hand-offs.
* **Scales for future submission types** (e.g., Qualified Supplier registrations, Transport Permits) via extensible columns, filters, and prioritization logic.

### Story Mapping Link
https://www.figma.com/board/quzLce5V1qGfBC3bxSmUUJ/Upload-and-Sanitize?node-id=0-1&t=G9zFbg0BVMRkRnVR-1

Resources:

https://docs.google.com/spreadsheets/d/1ZPxfFchziAGuOUdBUvY2rGR53YlYZGXwoJJCmhhviXU/edit?gid=0#gid=0

Policy related documents:

[Policy Memorandum - MHR Upload in Place of Originals (1).docx](https://api.zenhub.com/attachedFiles/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBNlJFQ3c9PSIsImV4cCI6bnVsbCwicHVyIjoiYmxvYl9pZCJ9fQ==--c389bbbb1b24c7bbd9bde7965f51c7be0b270338/Policy%20Memorandum%20-%20MHR%20Upload%20in%20Place%20of%20Originals%20%281%29.docx)

No repository files, tests, or entry points are identified in the issue. Start by reviewing the linked story map and policy documents, then establish the queue's scope and implementation plan before defining what completion means.

Written by the indexing model from the issue text.