Fix Citation System to Prevent LLM Hallucination

[LittleCoinCoin]

Description:
Refactor citation system to inject citations verbatim instead of allowing LLM to format them.

Acceptance Criteria:

• Citation formatting completely removed from LLM prompts and control
• Direct citation block injection after LLM response generation
• Structured citation templates that cannot be modified by LLM
• Citation accuracy guaranteed through verbatim injection from MCP server metadata
• injection into chat session files to track all citations

Dependencies:

• Requires Implement Basic Session Management #19

[LittleCoinCoin]

Note: Actually it seems this happens mainly when the citation's content is "not available" or generic texts. So it might simply be possible to keep the LLM formating it freely, but inject more accurate instructions about how to handle this field when needed.