feat(pinia-orm): support Intl.Collator for locale aware sorting

[CodeDredd]

Feature (#2006)

orderBy() sorted strings by code point, so non-English characters ended up in the wrong place (Š after U instead of between B and T in Lithuanian).

orderBy() on query & repository, useSortBy()/collect().sortBy() and the exported orderBy util now accept an Intl.Collator in addition to the existing SortFlags:

useRepo(Item).orderBy('name', 'asc', new Intl.Collator('lt')).get()
useSortBy(items, 'name', new Intl.Collator('lt'))

• Collators only compare string values; the existing null/undefined/number ordering is untouched.
• Each chained orderBy() can carry its own flag/collator (per-criterion flags array internally).
• A collator also unlocks { numeric: true }, case options etc. for free.
• Docs updated (orderBy() API page + useSortBy() helper page).

Tests

3 new tests: repository sort with lt collator, util-level collator sort, per-field mixed flags. Full suite green (412 tests).

closes #2006

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.35294% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.30%. Comparing base (018acee) to head (ee623e8).

Files with missing lines	Patch %	Lines
packages/pinia-orm/src/support/Utils.ts	75.00%	0 Missing and 2 partials ⚠️
packages/pinia-orm/src/query/Query.ts	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2033      +/-   ##
==========================================
- Coverage   99.40%   99.30%   -0.10%     
==========================================
  Files          82       82              
  Lines        3025     3030       +5     
  Branches      533      539       +6     
==========================================
+ Hits         3007     3009       +2     
  Misses         15       15              
- Partials        3        6       +3     

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