Merge the stock exceptions into the existing app-wide erpnext/exceptions.py (under a
'# stock' section) instead of a separate erpnext/stock/exceptions.py, matching the
established convention. stock_controller still re-exports them for backward
compatibility; services import from erpnext.exceptions.
Verified: ledger snapshots, quality inspection suite, stock_entry batch-expiry stay green.
Frozen field is moved to More Information section for Customer and Supplier. Any Supplier/Customer which is disabled will not be shown while creating PO/SO