[FEATURE]: Adding Authentication to `opencode server` api

[OpeOginni]

Feature hasn't been suggested before.

• [x] I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

If someone has an opencode server on a remote instance with a public URL, they should be able to simply add some sort of auth to it.

Maybe for serving opencode server --port 7800 --passkey super-shush-password

Then when attaching its added opencode run --attach https://opencode.com --passkey super-shush-password

Thinking of this as I plan to integrate just the server part of opencode as a service, but needs to make sure only the creator of an instance should have access.

I could work on this feature, but needs to be approved as needed.

[github-actions[bot]]

This issue might be a duplicate of existing issues. Please check:

• #988: Feature request: add MCP remote using oauth - Similar request for adding OAuth authentication to remote connections
• #878: Feature Request: Connect TUI to Existing opencode serve Instance - Addresses connecting to headless servers which would benefit from authentication
• #3165: Add --session flag to attach command to continue session via already running headless server - Related to remote server instance access
• #3188: opencode run --attach - Proposes attaching to a headless server, directly related to remote instance use case
• #4028: Inquiry: Programmatic access or Node.js SDK for OpenCode - Related to API/SDK access to running OpenCode instances

Feel free to ignore if none of these address your specific case.

[rekram1-node]

I think someone made basic auth, their first pr caused issues but I think their new one should work

[OpeOginni]

Cool cool, thank you