Add AdminMixin

[pfouque]

Proposal to add an AdminMixin based on https://github.com/etchegom/django-fsm-admin-lite ( #38 ).

Scope:

• Documentation
• Handle custom labels
• Hide transition on purpose
• Hide all transitions by settings with exceptions
• django-fsm-log compatibility
• Custom forms support (will be adressed in a following contribution)

[codecov]

Codecov Report

Attention: Patch coverage is 94.56522% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
django_fsm/admin.py	94.56%	5 Missing ⚠️

Files with missing lines	Coverage Δ
django_fsm/admin.py	94.56% <94.56%> (ø)

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[Copilot]

Pull Request Overview

This PR adds an AdminMixin that integrates Django FSM transitions with the administration interface, including support for django‐fsm-log and various customizations. Key changes include dependency additions (django‐fsm-log), tests for FSM admin functionality, updates to models and admin classes for state and step transitions, and documentation updates for admin integration.

Reviewed Changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tox.ini	Added django-fsm-log dependency
tests/testapp/tests/test_transition_all_except_target.py	Renamed test class to align with model naming
tests/testapp/tests/test_admin.py	Introduced tests to verify FSM admin transitions
tests/testapp/models.py	Added AdminBlogPost model with defined FSM transitions
tests/testapp/admin.py	Implemented AdminBlogPostAdmin using FSMAdminMixin
tests/settings.py	Updated installed apps and configured FSM log settings
pyproject.toml	Added dependency on django_fsm_log
django_fsm/templates/django_fsm/fsm_admin_change_form.html	Created a template for admin change form with FSM buttons
django_fsm/admin.py	Updated FSMAdminMixin implementation
README.md	Provided updated documentation for admin integration

Comments suppressed due to low confidence (2)

README.md:430

• The code example for customizing the label uses an invalid dictionary syntax; please use a colon (:) instead of '='. For example: custom={"label": "My awesome transition"}.

    fsm_field = ['my_fsm_field',]

README.md:454

• The code example demonstrating admin transition disallowance uses an invalid dictionary syntax; please update it to use a colon, for example: custom={"admin": False}.

       custom={"admin"=False},