feat(master-data): make Main type of activity read-only

This doctype is now populated exclusively from master_data JSON via the
hash-diff sync, so block create/write/delete in the UI and API by dropping
those permissions. The sync writes at the DB level so it is unaffected.
Also marks option_name read_only and drops allow_rename.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

taxes_az/taxes_az/doctype/main_type_of_activity/main_type_of_activity.json

@@ -1,6 +1,5 @@
 {
  "actions": [],
- "allow_rename": 1,
  "creation": "2025-01-09 14:43:12.245054",
  "doctype": "DocType",
  "engine": "InnoDB",
@@ -11,7 +10,8 @@
   {
    "fieldname": "option_name",
    "fieldtype": "Text",
-   "label": "Option Name"
+   "label": "Option Name",
+   "read_only": 1
   }
  ],
  "index_web_pages_for_search": 1,
@@ -23,16 +23,13 @@
  "owner": "Administrator",
  "permissions": [
   {
-   "create": 1,
-   "delete": 1,
    "email": 1,
    "export": 1,
    "print": 1,
    "read": 1,
    "report": 1,
    "role": "System Manager",
-   "share": 1,
-   "write": 1
+   "share": 1
   }
  ],
  "search_fields": "option_name",