fix: partial writes support

[alespour]

Closes #

Proposed Changes

• Fixes example - now uses sample input from official documentation
• Fixes line number parsing

Checklist

• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.53%. Comparing base (0287213) to head (169ae9c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   94.51%   94.53%   +0.02%     
==========================================
  Files          18       18              
  Lines        2006     2014       +8     
==========================================
+ Hits         1896     1904       +8     
  Misses         82       82              
  Partials       28       28              

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[Copilot]

Pull request overview

Updates partial-write documentation, error detail formatting, and e2e coverage to better reflect how partial writes behave across V2 vs V3 write endpoints.

Changes:

• Document that AcceptPartial and structured PartialWriteError details require using the V3 write endpoint (UseV2Api: false), and update the README example payload.
• Improve partial-write error detail formatting to include line-numbered messages even when original_line is absent.
• Extend e2e test logic to support cases where only “non-empty line errors” should be asserted, and add endpoint-specific partial-write test cases.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
README.md	Clarifies V3 endpoint requirement for structured partial write errors and updates the example.
influxdb3/partial_write_error.go	Enhances formatting of partial write error details when OriginalLine is missing.
influxdb3/client_e2e_test.go	Adds/adjusts e2e test assertions around partial-write behavior across V2 vs V3 endpoints.

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