Add oca-purchase submodule with 96 purchase modules moved from oca-workflow-process

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

odoo-bringout-oca-purchase-workflow-purchase_discount/doc/REPORTS.md

@@ -0,0 +1,25 @@
+# Reports
+
+Report definitions and templates in purchase_discount.
+
+```mermaid
+classDiagram
+    class PurchaseReport
+    Model <|-- PurchaseReport
+```
+
+## Available Reports
+
+No named reports found in XML files.
+
+
+## Report Files
+
+- **__init__.py** (Python logic)
+- **purchase_report.py** (Python logic)
+
+## Notes
+- Named reports above are accessible through Odoo's reporting menu
+- Python files define report logic and data processing
+- XML files contain report templates, definitions, and formatting
+- Reports are integrated with Odoo's printing and email systems