fix pytest-django dep skip issue on fastapi project

[wey-gu]

as titled...

[Copilot]

Pull Request Overview

This PR fixes how pytest-django tests are skipped when the plugin is missing, bumps the package version, and updates examples/docs to clarify optional pytest-django integration.

• Use an explicit pytest-django marker for skipping tests
• Bump version from 0.2.0 to 0.2.1
• Clarify and enhance example usage and README instructions for optional pytest-django integration

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
py_pglite/pytest_plugin.py	Change marker name for pytest-django skip check
py_pglite/init.py	Bump package version to 0.2.1
examples/testing-patterns/django/test_pytest_django.py	Update example docstring and comments for optional integration
examples/README.md	Add commands for both basic Django tests and pytest-django usage

Comments suppressed due to low confidence (1)

examples/testing-patterns/django/test_pytest_django.py:122

• [nitpick] Mixing Chinese and English in code comments may confuse readers. Consider using a single language consistently for example comments.

# Django tests (基础用法)

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 20.64%. Comparing base (bf09b41) to head (83ff2de).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
py_pglite/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   20.64%   20.64%           
=======================================
  Files          15       15           
  Lines        1114     1114           
=======================================
  Hits          230      230           
  Misses        884      884           

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