Reorganize tools for better categorization

[yorkeccak]

Summary

• Add universal search tool as catchall across all Valyu sources
• Rename bioSearch → lifeSciencesSearch with expanded NCBI genomics sources (Gene, SNP, ClinVar, GEO, SRA)
• Rename paperSearch → academicSearch for clarity
• Add contents tool for URL content extraction (parity with MCP server)
• Clean up source overlap between financeSearch and economicsSearch
• Add backwards-compatible aliases for bioSearch and paperSearch

New Tool Structure

Tool	Purpose
search	Universal catchall
webSearch	Web-focused with include/exclude filtering
financeSearch	Markets, SEC, fundamentals
academicSearch	Papers (arXiv, PubMed, bioRxiv, medRxiv)
lifeSciencesSearch	Clinical, pharma, genomics databases
economicsSearch	BLS, FRED, World Bank
patentSearch	Patents
secSearch	SEC filings
contents	URL content extraction
companyResearch	Company intelligence

Breaking Changes

None - backwards-compatible aliases provided for bioSearch and paperSearch.

Test Plan

• Build passes
• Existing code using bioSearch/paperSearch still works via aliases
• New tools (search, contents, lifeSciencesSearch, academicSearch) work correctly