feat: add reject/accept to Activity class

[AmaseCocoa]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/apmodel/mixins/activity.py	50.00%	4 Missing ⚠️

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[gemini-code-assist]

Code Review

This pull request adds an ActivityMixin to the core schema and implements it in a new Python module to provide helper methods for creating Accept and Reject activities. Feedback suggests making the id parameter optional, allowing the actor to be a string, and adding future annotations for better type handling.

[gemini-code-assist]

The current implementation of accept and reject requires an id as a positional argument. In many ActivityPub scenarios, the ID of a new activity might not be known at creation time (e.g., it's assigned by the server later) or should be optional.

Additionally, the actor parameter is typed strictly as Actor, but in practice, it is often provided as a URI string.

I suggest:

1. Making id optional with a default of None.
2. Swapping the order of actor and id to allow id to be optional while keeping actor required.
3. Allowing actor to be a str.
4. Adding from __future__ import annotations to simplify type hints and avoid circular evaluation issues at runtime.

Suggested change

	from typing import TYPE_CHECKING
	if TYPE_CHECKING:
	from apmodel.activity import Accept, Reject
	from apmodel.core import Activity
	from apmodel.objects import Actor
	class ActivityMixin:
	def accept(self: "Activity", id: str, actor: "Actor") -> "Accept":
	from apmodel.activity.accept import Accept
	return Accept(id=id, actor=actor, object=self)
	def reject(self: "Activity", id: str, actor: "Actor") -> "Reject":
	from apmodel.activity.reject import Reject
	return Reject(id=id, actor=actor, object=self)
	from __future__ import annotations
	from typing import TYPE_CHECKING
	if TYPE_CHECKING:
	from apmodel.activity import Accept, Reject
	from apmodel.core import Activity
	from apmodel.objects import Actor
	class ActivityMixin:
	def accept(self: Activity, actor: Actor | str, id: str | None = None) -> Accept:
	from apmodel.activity.accept import Accept
	return Accept(id=id, actor=actor, object=self)
	def reject(self: Activity, actor: Actor | str, id: str | None = None) -> Reject:
	from apmodel.activity.reject import Reject
	return Reject(id=id, actor=actor, object=self)