Add user and request context for admin class

[vsdudakov]

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Summary

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[Copilot]

Pull request overview

This pull request adds request and user context support to admin model classes, allowing admin methods to access the current request object and authenticated user within their implementation. The feature uses Python's ContextVar to maintain thread-safe, async-context-isolated storage of request and user objects.

Changes:

• Added request and user properties to BaseModelAdmin using ContextVar for async-safe context isolation
• Updated all API service methods to bind request and user context to admin models before executing operations
• Extended framework integrations (Flask, FastAPI, Django) to pass request objects through to the service layer

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
fastadmin/models/base.py	Added _request_context and _user_context ContextVar attributes, request/user properties, and set_context() method to BaseModelAdmin
fastadmin/api/service.py	Added _bind_admin_context() helper and _get_authenticated_user() method; updated all API methods to accept and bind request/user context
fastadmin/models/helpers.py	Updated generate_models_schema() to accept and propagate request/user context to admin models and inlines
fastadmin/api/frameworks/flask/api.py	Updated all API endpoints to pass request=request to service methods
fastadmin/api/frameworks/fastapi/api.py	Updated all API endpoints to pass request=request to service methods
fastadmin/api/frameworks/django/app/api.py	Updated all API endpoints to pass request=request to service methods
tests/models/test_base.py	Added test for request/user context get/set functionality
tests/api/test_service.py	Added test verifying context binding in the list operation
tests/api/frameworks/flask/test_app.py	Updated dashboard widget test to verify request parameter passing
tests/api/frameworks/fastapi/test_app.py	Updated dashboard widget test to verify request parameter passing
tests/api/frameworks/django/test_app.py	Updated dashboard widget test to verify request parameter passing
docs/index.html	Added documentation and example code demonstrating context usage in admin methods
docs/build.py	Updated version changelog and added documentation content for the new feature

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