Make maximum message length configurable (currently hardcoded to 32000)

[GMAILPRO777]

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Feature request

Which Nextcloud Version are you currently using:
34.0.2

Is your feature request related to a problem? Please describe.
Currently, Nextcloud Talk has a hardcoded limit of 32,000 characters per message. When trying to share large logs, long text notes, or code snippets, the mobile and desktop clients fail with a "character limit reached". This limit is too restrictive for advanced users and sysadmins who use Talk as a primary tool for work and technical discussions.

Describe the solution you'd like
It would be great to move this limit from a hardcoded internal constant to a configurable variable. Ideally, admins should be able to adjust this threshold (e.g., apps/spreed/message_limit) in config.php or change it directly through the Talk settings panel in the admin UI.

Describe alternatives you've considered
Sharing .txt or .md files is a possible alternative, but it significantly slows down quick text-based debugging and discussions in group chats.

Additional context
This configuration option will help administrators balance server database load according to their organization's specific needs without breaking updates.
frustrated when …”

[nickvergessen]

The limitation is just forwarded from the database layer and how comments are stored.
We plan to migrate Talk chat messages away from the Nextcloud comments, but until then the limitation is out side of our control.