fix(selling): make commission_rate a Percent field on Sales Person and Sales Team

commission_rate was a free-text Data field on the Sales Person master and the
Sales Team child, storing percentages as strings. Convert both to Percent.

A pre_model_sync patch sanitizes the existing values first (empty / NULL /
non-numeric -> 0, others normalised via flt) so the Data -> Percent column
change casts cleanly under strict SQL mode, where Percent is a NOT NULL
decimal column. The patch is idempotent and avoids db-specific SQL so it works
on both MariaDB and Postgres.

erpnext/setup/doctype/sales_person/sales_person.json

@@ -54,7 +54,7 @@
   },
   {
    "fieldname": "commission_rate",
-   "fieldtype": "Data",
+   "fieldtype": "Percent",
    "label": "Commission Rate",
    "print_hide": 1
   },
@@ -145,7 +145,7 @@
  "idx": 1,
  "is_tree": 1,
  "links": [],
- "modified": "2024-03-27 13:10:37.891377",
+ "modified": "2026-06-21 12:52:33.742603",
  "modified_by": "Administrator",
  "module": "Setup",
  "name": "Sales Person",
@@ -184,4 +184,4 @@
  "sort_field": "creation",
  "sort_order": "ASC",
  "states": []
-}
+}