[API] Enforce pk ordering for API endpoints

[SchrodingersGat]

• Closes Paginated API returns duplicate items and silently drops others due to missing stable sort order #11442
• Enforces additional ordering by 'pk' field for API filtering
• Ensures the result ordering is not ambiguous across pagination boundaries
• Adds a unit test known to throw errors without this fix

References

• Paginated API returns duplicate items and silently drops others due to missing stable sort order #11442
• Inconsistent pagination when sorting by non-unique columns encode/django-rest-framework#8840

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[Copilot]

Pull request overview

This PR addresses unstable ordering in paginated API list endpoints by ensuring a deterministic ordering that avoids duplicates / dropped items across pagination boundaries (ref #11442).

Changes:

• Updates the custom DRF ordering backend to enforce a stable ordering by appending a tie-breaker field.
• Replaces aliased ordering filter backend constants across multiple API modules to consistently use the custom ordering backend.
• Adds a regression test covering pagination stability for the stock list endpoint.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/backend/InvenTree/stock/test_api.py	Adds a pagination regression test for /api/stock/ to detect duplicate PKs across pages.
src/backend/InvenTree/stock/api.py	Switches list endpoints to the updated ordering backend constant.
src/backend/InvenTree/part/api.py	Switches list endpoints to the updated ordering backend constant.
src/backend/InvenTree/order/api.py	Switches list endpoints to the updated ordering backend constant and simplifies imports.
src/backend/InvenTree/company/api.py	Switches list endpoints to the updated ordering backend constant and removes alias import.
src/backend/InvenTree/common/api.py	Switches list endpoints to the updated ordering backend constant and simplifies imports.
src/backend/InvenTree/build/api.py	Switches list endpoints to the updated ordering backend constant.
src/backend/InvenTree/InvenTree/filters.py	Implements stable ordering behavior in InvenTreeOrderingFilter and consolidates filter backend constants.

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[codspeed-hq]

Merging this PR will degrade performance by 14.5%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

❌ 33 regressed benchmarks
✅ 11 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	WallTime	test_api_list_performance[/api/part/]	74.2 ms	79.5 ms	-6.6%
❌	WallTime	test_api_list_performance[/api/stock/]	160 ms	176.1 ms	-9.15%
❌	WallTime	test_api_list_performance[/api/stock/location/]	20 ms	22.8 ms	-12.31%
❌	WallTime	test_api_options_performance[/api/parameter/template/]	8.9 ms	9.6 ms	-7.71%
❌	WallTime	test_api_options_performance[/api/parameter/]	12.7 ms	14.3 ms	-11.35%
❌	WallTime	test_api_list_performance[/api/part/category/]	16.6 ms	19.3 ms	-14.14%
❌	WallTime	test_api_options_performance[/api/order/po-line/]	160.4 ms	173.8 ms	-7.72%
❌	WallTime	test_api_list_performance[/api/build/]	42 ms	47.8 ms	-12.18%
❌	WallTime	test_api_options_performance[/api/user/roles/]	6.3 ms	6.8 ms	-7.49%
❌	WallTime	test_search_performance[supplierpart]	39.2 ms	42.6 ms	-8.12%
❌	WallTime	test_search_performance[all]	359 ms	392.9 ms	-8.64%
❌	WallTime	test_api_list_performance[/api/build/item/]	332.3 ms	367.6 ms	-9.61%
❌	WallTime	test_api_list_performance[/api/user/roles/]	8.8 ms	9.9 ms	-10.88%
❌	WallTime	test_search_performance[stocklocation]	17.5 ms	18.7 ms	-6.6%
❌	WallTime	test_search_performance[build]	34.5 ms	37.8 ms	-8.73%
❌	WallTime	test_api_list_performance[/api/order/so/]	45.9 ms	50.8 ms	-9.65%
❌	WallTime	test_api_options_performance[/api/part/category/]	14.4 ms	15.9 ms	-9.81%
❌	WallTime	test_api_list_performance[/api/order/so/shipment/]	22.1 ms	24.5 ms	-9.69%
❌	WallTime	test_api_list_performance[/api/parameter/]	11.5 ms	13 ms	-11.23%
❌	WallTime	test_api_options_performance[/api/stock/location/]	24 ms	27.3 ms	-12.13%
...	...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

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_{Comparing SchrodingersGat:api-ordering (bee91ac) with master (2c67454)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.03%. Comparing base (2c67454) to head (bee91ac).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #11446   +/-   ##
=======================================
  Coverage   88.02%   88.03%           
=======================================
  Files        1296     1296           
  Lines       59003    59038   +35     
  Branches     1938     1938           
=======================================
+ Hits        51940    51974   +34     
- Misses       6581     6582    +1     
  Partials      482      482           

Flag	Coverage Δ
backend	89.23% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Backend Apps	91.72% <100.00%> (+<0.01%)	⬆️
Backend General	93.37% <100.00%> (ø)
Frontend	70.81% <ø> (ø)

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[github-actions]

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Status	Branch	Result
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