refactoring: ♻️ improve naming consistency by renaming DeferredBus → DeferredDispatcher

[remimd]

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[Copilot]

Pull Request Overview

This PR refactors the codebase to improve naming consistency by renaming DeferredBus to DeferredDispatcher and consolidating related interfaces.

• Renames DeferredBus to DeferredDispatcher across the codebase
• Moves DeferredDispatcher protocol definition from a standalone file to the base dispatcher module
• Updates FastAPI integration to use the new naming convention and adds use_cache=False to dependency configuration

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
cq/ext/fastapi.pyi	Removes old type definitions file
cq/ext/fastapi.py	Updates FastAPI integration with new naming and adds proper type checking blocks
cq/_core/dispatcher/bus.py	Reorders abstract methods in Bus protocol
cq/_core/dispatcher/base.py	Adds DeferredDispatcher protocol definition
cq/_core/defer.py	Removes old DeferredBus protocol file
cq/init.py	Updates exports to use new DeferredDispatcher naming

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