[nike-nike21]

Description

This PR introduces calendar export functionality, enhanced authentication features, and database performance improvements.

Changes

• Added calendar export support for project milestones and deadlines, including Google Calendar and Apple Calendar via .ics files.
• Added two-factor authentication using TOTP for improved account security.
• Optimized database queries by analyzing slow queries and adding appropriate indexes.
• Added query performance monitoring and EXPLAIN ANALYZE coverage for critical queries.
• Added OAuth2 social authentication with Google and GitHub.

Issues Closed

Closes #796
Closes #797
Closes #798
Closes #799

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