[Backport version-16-hotfix] feat: add Material Request Procurement Audit report

[github-actions]

Backport of #159 to version-16-hotfix.

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Summary

Adds a standard ERPNext v15 Script Report, Material Request Procurement Audit, to provide a complete audit trail from Material Request through ordering and receipt.

Unlike the standard open-request style reports, this report deliberately keeps fully ordered and fully received Material Request Items visible so historical procurement can be audited.

What the report shows

• Requested quantity from submitted Purchase-type Material Requests
• ERPNext-maintained ordered quantity
• Independently reconstructed quantity from submitted Purchase Orders
• Pending quantity to order
• ERPNext-maintained received quantity
• Accepted quantity traced from submitted Purchase Receipts
• Direct stock receipt quantity from submitted Purchase Invoices with update_stock = 1
• Rejected quantity
• Pending quantity to receive
• Requested quantity not yet received
• PO and receipt audit differences
• Suppliers, Purchase Orders, Purchase Receipts, and stock Purchase Invoices
• Procurement lifecycle status
• Audit exception messages

All quantity comparisons are performed in Stock UOM.

Audit controls

The report compares ERPNext's maintained ordered_qty / received_qty values against independently traced submitted procurement documents. This helps identify broken links, over-ordering, over-receipt, rejected stock, or quantity inconsistencies.

Stock Purchase Invoices that already reference a Purchase Receipt are excluded from the direct-PI receipt trace to prevent double-counting the same physical receipt.

Filters

• Company
• Semantic MR date range (Today, Week, Month, Year, custom Period, or All)
• Material Request
• Item
• Warehouse
• Project
• Procurement Status
• Show Only Audit Exceptions

Files

• material_request_procurement_audit.py
• material_request_procurement_audit.js
• material_request_procurement_audit.json
• report package __init__.py

Validation

• Python syntax compilation passed
• JavaScript syntax check passed
• Report JSON validation passed
• Branch comparison: only the new report package is changed

Target: version-15-hotfix