feat(scholar): Add comprehensive citation style management

[ywatanabe1989]

Summary

Add comprehensive citation style management to scitex.scholar module for formatting paper metadata in various academic citation styles.

Current State

• Work.citation(style='apa') method exists in crossref_scitex but limited
• No centralized citation formatting utilities
• Relies on local crossref database which may not always be available

Proposed Features

1. Citation Style Support

Support common academic citation styles:

• APA (7th edition) - Psychology, Education, Social Sciences
• MLA (9th edition) - Humanities
• Chicago (Author-Date) - Sciences, Social Sciences
• IEEE - Engineering, Computer Science
• Vancouver - Medicine, Biology
• Harvard - General academic

2. API Design

from scitex.scholar import citation

# Format from DOI
citation.format("10.1038/nature12373", style="apa")
# Output: "Author, A. B., & Author, C. D. (2023). Title of article. Journal Name, 12(3), 45-67. https://doi.org/10.1038/nature12373"

# Format from Work object
work = crossref_scitex.get("10.1038/nature12373")
citation.format(work, style="ieee")

# Batch formatting
citations = citation.format_batch(doi_list, style="vancouver")

# List available styles
citation.list_styles()  # ['apa', 'mla', 'chicago', 'ieee', 'vancouver', 'harvard']

3. Integration Points

• crossref_scitex.Work.citation() - already exists, enhance it
• openalex_scitex - add same functionality
• stx.scholar.Paper - unify citation formatting

Use Cases

1. Publications page on scitex-cloud needs consistent citation display
2. Manuscript writing with proper bibliography formatting
3. Export citations for reference managers

Related

• Used by: scitex-cloud/apps/public_app/views/pages.py (publications page)
• Module: scitex.scholar.local_dbs.crossref_scitex