feat: support launch browser from cli and http api

[pixel4696]

Git credential manager may start an OAuth, but computer does not starts a browser for login.

[owui-terminator]

⚠️ Missing Issue Title Prefix

@pixel4696, your issue title is missing a categorising prefix (e.g. bug:, feat:, docs:).

Please update the title to lead with one of:

• bug: bug report or error
• feat: feature request or enhancement
• docs: documentation issue
• question: usage question
• help: support request

Example: bug: Login fails when the password contains special characters

[owui-terminator]

🔍 Related Issues Found

I found some existing issues that might be related. Please check if any of these are duplicates or contain helpful solutions:

1. 🟣 #1 feat: cptr as open terminal
   This issue is about making cptr/Open Terminal fully compatible with Open WebUI, which is the same integration area as proxying OAuth browser launches back to the Open Computer browser. It is the closest existing discussion of terminal/browser interoperability in this repository.
   by tjbck

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💡 If your issue is a duplicate, please close it and add any additional details to the existing issue instead.

This comment was generated automatically. React with 👍 if helpful, 👎 if not.

[pixel4696]

Please consider adding http API or cptr cli to launch/close tab or retrieve/set cookies. this would allow launching pages on terminal, and the agent will know how to use them