feat(collector): support collector_author override on registration (#317)

[SamuelHassine]

Proposed changes

• Declare the optional collector_author attribute on CollectorManager create attrs,
  mirroring the existing injector_author support on InjectorManager.
• Forward the optional collector_author configuration key in the registration payload
  built by CollectorDaemon._setup(). When the key is not configured it resolves to
  None and the platform keeps its name-based author fallback.
• Document the new optional key in the CollectorDaemon docstring.

This lets a collector whose display name is not a good author declare a proper author
for its payloads and arsenal contracts, while the default remains the collector name
(never a generic default like "Filigran").

Testing Instructions

1. Run any collector without collector_author: payloads keep being authored by the
   collector's name (platform-side fallback, unchanged behavior).
2. Set collector_author in a collector's configuration hints and restart it: newly
   upserted payloads are authored by the declared author organization.

Related issues

• Closes feat(collectors): support collector_author override on collector registration #317

[Copilot]

Pull request overview

Adds support for an optional collector_author override during collector registration, aligning collector registration capabilities with the existing injector-side injector_author behavior.

Changes:

• Document the new optional collector_author configuration key on CollectorDaemon.
• Include collector_author in the collector registration payload built by CollectorDaemon._setup().
• Declare collector_author as an optional create attribute on CollectorManager.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pyoaev/daemons/collector_daemon.py	Documents and forwards the optional collector_author configuration key in the collector registration payload.
pyoaev/apis/collector.py	Extends CollectorManager create schema to accept optional collector_author.

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