Feat/vakil friend chat history persistence

[Nareshkumawat-star]

Pull Request: Vakil Friend AI Chat Conversation History Persistence

Description

Fixes an issue where refreshing the page, navigating away, or re-opening the browser cleared all Vakil Friend AI chat conversation history.

Issue Resolved

Closes #1629

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Key Changes Made

1. Frontend Active Session Auto-Resume: Updated VakilFriendPage.jsx to load vakil_friend_active_session_id from localStorage on component mount and restore the full conversation.
2. LocalStorage Fallback: Caches up to 50 of the latest messages under vakil_friend_cached_messages for instant rendering during network degradation.
3. Backend History Endpoints:
   • GET /api/v1/vakil-friend/chat/history: Retrieves the user's active/latest session history.
   • POST /api/v1/vakil-friend/chat/messages: Appends user or assistant messages to the active session.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

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