feat(axios): support persistBy 'fresh' to replace store data

[CodeDredd]

Feature (#1885)

persistBy now additionally accepts 'fresh', which persists the response through the repository's fresh() method — the response replaces all existing records of the entity, so records deleted on the server disappear from the store too:

useAxiosRepo(User).api().get('/api/users', { persistBy: 'fresh' })

Works per request, per model config, or globally in createPiniaOrmAxios() like every other plugin option. Docs updated (configuration page).

Tests

2 new tests: fresh removes stale records / keeps response records, insert still merges. Axios suite green (25 tests).

closes #1885

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.47%. Comparing base (c6bebb9) to head (7f2584f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2035      +/-   ##
==========================================
+ Coverage   99.40%   99.47%   +0.06%     
==========================================
  Files          82       82              
  Lines        3025     3025              
  Branches      533      533              
==========================================
+ Hits         3007     3009       +2     
+ Misses         15       13       -2     
  Partials        3        3              

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