[Feature]: Support Multiple OAuth Profiles per Provider with Fallback Mechanism

[anurag162008]

Problem Statement

With OAuth support:
Only one OAuth session/profile can be used
If access token fails / expires unexpectedly
If account hits limits or gets restricted
👉 The workflow stops and requires manual re-authentication or switching

Proposed Solution

Multiple OAuth Profiles per Provider
Allow users to configure multiple OAuth profiles under a single provider.
Example:
provider: openai/codex
profiles:

• type: oauth
  name: account_1
  access_token: auto
  refresh_token: auto

• type: oauth
  name: account_2
  access_token: auto
  refresh_token: auto

• type: oauth
  name: account_3
  access_token: auto
  refresh_token: auto

Alternatives Considered

No response

Success Criteria

Users can add multiple OAuth profiles under a single provider
Each OAuth profile maintains independent tokens (access + refresh)
System automatically switches to the next available OAuth profile when:
Access token fails
Rate limit is hit
API request returns error/timeout
No interruption in running tasks during profile switching
Each profile supports:
Automatic token refresh
Expiry handling without affecting other profiles
Users can:
Set priority/order of OAuth profiles
Identify profiles using custom names
UI allows:
Adding multiple OAuth logins per provider
Viewing profile status (active / expired / failed)
System tracks profile state and avoids repeatedly using failed profiles (cooldown/retry logic)

Additional Context

No response