Feature request: Bot / service account support for API integrations

We're integrating Fizzy into our development workflow using the fizzy-mcp server to let AI agents interact with boards programmatically. Currently, API access requires Personal Access Tokens tied to human user accounts.

This means we have to create a regular human user to represent a bot — which works, but has drawbacks:

• The "user" consumes a seat and appears in user lists alongside real humans
• No way to distinguish bot actions from human actions in the UI
• No bot-specific permissions or rate limits

Proposal

Support a bot / service account user type that:

• Can generate Personal Access Tokens like regular users
• Is visually distinguishable in the UI (e.g., a bot badge on comments/actions)
• Doesn't consume a regular user seat
• Can be scoped to specific boards or permissions

Context

Basecamp 3 had chatbot support. A similar concept for Fizzy's API would make it much easier to build integrations where actions are correctly attributed to bots rather than phantom human accounts.

On a related note — we're also looking forward to the official MCP server landing via #2298, which would make integrations like this even smoother.