feat: Generate Citations

[4ndrelim]

1. We introduce a complementary tool to verify-citations, allowing users to easily generate citations into their .bib file by pasting URLs, arxiv IDs, DOIs, or generic titles.
2. [Follow-up] Currently, the result is returned to the user for copy-pasting. We can consider directly modifying the user's .bib file in a subsequent PR.
3. XtraMCP tag has been updated to use the latest stable version.

Additional:

1. Tool Prompts have been updated for improved performance

Generated citation is as expected.

[Copilot]

Pull request overview

This PR introduces a new generate_citations tool to complement the existing verify_citations functionality, allowing users to generate citations from URLs, arXiv IDs, DOIs, or titles. The PR also updates the XtraMCP server version, improves tool prompts, and enables two previously commented-out tools (search_user and get_user_papers).

Changes:

• Added generate_citations tool with a dedicated UI component following the same pattern as verify_citations
• Updated default prompts with improved instructions and clearer parameter documentation
• Upgraded XtraMCP server image to sha-79eb631
• Enabled search_user and get_user_papers tools
• Added a hardcoded date warning for paper search results

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
webapp/_webapp/src/components/message-entry-container/tools/xtramcp/utils/common.tsx	Registered generate_citations tool and enabled search_user and get_user_papers tools in the XtraMCP tool list
webapp/_webapp/src/components/message-entry-container/tools/xtramcp/search-relevant-papers.tsx	Added hardcoded warning message about paper database cutoff date (31st Dec 2025)
webapp/_webapp/src/components/message-entry-container/tools/xtramcp/generate-citations.tsx	New React component for displaying generate_citations tool results with metadata dropdown
webapp/_webapp/src/components/message-entry-container/tools/tools.tsx	Imported and integrated GenerateCitationsCard component into the tool routing logic
internal/api/user/list_prompts.go	Comprehensive update to default prompts with improved instructions, added new "Tool List" and "Generate Citations" prompts, reorganized and enhanced existing prompts
helm-chart/values.yaml	Updated XtraMCP server image tag from sha-2f1404c to sha-79eb631

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[Junyi-99]

This is a pure backend PR and not involving any protocol change, will be deployed soon