Fix/rag service fallback safety disclaimer

[Nareshkumawat-star]

Description

Fixes a high-severity legal misinformation risk where Vakil Friend AI generated fabricated IPC/BNS section numbers and case citations when the lawgpt-service RAG microservice was offline or unreachable.

Issue Resolved

Closes #1622

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Security & Trust/Safety Enhancement

Key Changes Made

1. RAG Fallback Signal (RagService.java):
   • Updated findRelevantContext to return a RAG_UNAVAILABLE signal when lawgpt-service connection fails.
2. System Prompt Safety Enforcement (VakilFriendService.java):
   • Injected mandatory system instructions when RAG is offline, requiring the AI to open with: "I'm unable to retrieve verified legal references right now", disallowing section number citations, and recommending official legal counsel.

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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