Feature/integrated auth and dashboard

[nikhilkulkarni1755]

🔐 Integrate OAuth Authentication into Dashboard Workflow

Overview

Streamlines agent setup by eliminating the confusing two-step authentication process. Users now authenticate directly through the dashboard UI instead of manually running npx mcp-remote.
What Changed

Before:
Step 1: Manual auth (confusing for beginners)
npx mcp-remote https://mcp.paxai.app/mcp/agents/twitter_agent --oauth-server https://api.paxai.app

Step 2: Start dashboard
python3 scripts/start_dashboard.py

After:
Single command - auth happens in UI
python3 scripts/start_dashboard.py

Key Features

✅ One-click authentication - Auth modal appears when needed
✅ Visual feedback - Real-time progress during OAuth flow
✅ Auto-retry - Monitor starts automatically after successful auth
✅ Version-agnostic - Finds tokens across all mcp-remote versions (0.1.29, 0.1.35, 0.1.36+)
✅ Universal - Works identically for all agents (twitter, message_draft, nano_banana_pro, etc.)

Technical Improvements

New TokenValidator class searches all mcp-remote directories
OAuthManager handles async OAuth flow with proper timeout/error handling
Fixed stdin JSON parsing errors in mcp-remote subprocess
Added pre-flight auth checks before starting monitors
Robust process cleanup prevents success/failure state corruption

Files Added/Modified

src/ax_agent_studio/auth/ - New authentication modules
src/ax_agent_studio/dashboard/backend/main.py - Auth status API endpoints
src/ax_agent_studio/dashboard/frontend/ - Auth modal and flow handling

Fixes the big user onboarding pain point and makes the setup process significantly more beginner-friendly.

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[madtank]

Thanks for this PR - nice improvement for first-time user onboarding!

A couple of small fixes before we merge:

1. Type hint fix: Dict[str, any] should be Dict[str, Any] (capital A) in:

   • src/ax_agent_studio/auth/token_validator.py:74
   • src/ax_agent_studio/auth/oauth_manager.py:33

   You'll also need to add Any to the typing import.

2. Redundant import: In src/ax_agent_studio/dashboard/backend/main.py:647, there's an inline from ax_agent_studio.auth import OAuthManager but it's already imported at the top of the file (line 21). Can remove the duplicate.

Once those are fixed, we'll merge it. 👍

[madtank]

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Let us know if you have any questions!

[nikhilkulkarni1755]

I have read the CLA Document and I hereby sign the CLA