[FEATURE] Switch between plans in VS Code extension

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I have multiple enterprise plans for my account.
I want to switch in VS Code between those plans (for example, if one plan is rate-limited).

Proposed Solution

Give an option to select in VS Code the active plan for an account with multiple plans.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Configuration and settings

Use Case Example

I have two 20$/25$ enterprise plans on my account. After one plan is rate-limited, I want to switch to the other plan on VS Code (Claude extension).

Additional Context

_No response_