fix(postgres): avoid UNSIGNED cast in customer autoname

[ili-ad]

Summary

Fix Customer autoname on Postgres by removing MariaDB-only CAST(... AS UNSIGNED).

Problem

Creating a Customer (including via Sales Invoice customer field) can fail on Postgres with:

psycopg2.errors.UndefinedObject: type "unsigned" does not exist

Root cause: Customer.get_customer_name() uses CAST(... AS UNSIGNED) to compute the next suffix when a duplicate name exists.

Fix

• On Postgres, extract the trailing digits from names like Customer - 3 using:
  SUBSTRING(name FROM '\d+$') and cast to INTEGER.
• Keep existing MariaDB/MySQL behavior unchanged.

Tests

• pre-commit run --all-files ✅
• Manual: Creating duplicate customer names works on Postgres (e.g. Test, then Test - 1, Test - 2).

Notes

Server-side logic only; no UI changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between 57624e1 and 323636b.

📒 Files selected for processing (1)

• erpnext/selling/doctype/customer/customer.py

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.09%. Comparing base (3acc3e6) to head (323636b).
⚠️ Report is 178 commits behind head on develop.

Files with missing lines	Patch %	Lines
erpnext/selling/doctype/customer/customer.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #51558      +/-   ##
===========================================
- Coverage    79.09%   79.09%   -0.01%     
===========================================
  Files         1179     1179              
  Lines       121452   121455       +3     
===========================================
+ Hits         96063    96065       +2     
- Misses       25389    25390       +1     

Files with missing lines	Coverage Δ
erpnext/selling/doctype/customer/customer.py	74.64% <75.00%> (-0.07%)	⬇️

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[ruthra-kumar]

@ili-ad

Can't reproduce the same error - psycopg2.errors.UndefinedObject: type "unsigned" does not exist. Any other way to trigger?