feat(ai-gateway): add user-platform AI session management endpoints a…

[soumya07ad]

…nd update Postman collection

• Introduced new endpoints for managing AI sessions: GET, POST, PATCH, and DELETE at /v1/ai/sessions.
• Updated Postman collection to include new session management requests and added access_token and session_id parameters.
• Enhanced main.py to support session management and added CORS preflight handling.
• Updated Helm values for production and development environments to include USER_PLATFORM_URL and related configurations.
• Added tests for CORS preflight handling in the chat stream proxy.

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