Refactor birthday feature from Google Sheets to database storage

[Copilot]

This PR completely refactors the birthday feature to use database storage instead of Google Sheets, addressing all requirements from the issue.

Summary of Changes

Database Schema

• Added Birthday column (nullable datetime) to users table
• Implemented automatic database migration for existing installations
• Added birthday-specific database methods: UpdateBirthday(), GetBirthday(), GetTodaysBirthdays(), GetNextBirthday()

New Commands

• !setbirthday MM/DD[/YYYY] (alias: !setbday) - Allows users to set their birthday
• !removebirthday (aliases: !removebday, !deletebirthday, !deletebday) - Allows users to remove their birthday

Updated Existing Commands

• !bday - Now retrieves next upcoming birthday from database instead of Google Sheets
• !bday @user - Now retrieves specific user's birthday from database with improved error messaging

Service Updates

• Completely refactored BirthdayAnnouncementService to use database queries
• Birthday announcements now mention users (key requirement!) - e.g., "🎉 Happy Birthday @username! 🎂"
• Enhanced error handling for users who have left the guild
• Improved logging with user IDs for better tracking

Key Features Implemented

✅ Database storage - No more dependency on Google Sheets
✅ Direct birthday management - Users can add/remove their own birthdays
✅ User mentions in announcements - Announcements now properly mention the birthday user
✅ Backwards compatibility - All existing !bday functionality preserved
✅ Flexible date formats - Supports MM/DD and MM/DD/YYYY formats

Technical Details

• Uses year 1900 as sentinel value for birthdays without year specified
• Maintains existing announcement schedule (configurable interval, default 4 hours)
• All database operations use existing ORM patterns for consistency
• Comprehensive error handling for edge cases (missing users, invalid dates, etc.)
• Zero breaking changes - all existing functionality preserved

Testing

• All code compiles successfully with no new errors
• Database schema automatically migrates on startup
• Maintains same user experience for existing commands
• New commands follow established patterns and error handling

Fixes #335.

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[deepsource-io]

Here's the code health analysis summary for commits 2c438a1..7b39364. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
C#	❌ Failure	❗ 4 occurences introduced 🎯 3 occurences resolved	View Check ↗

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[Pierre-Demessence]

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[Pierre-Demessence]

/deploy_dev

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🚀 Starting deployment of Unity-Developer-Community/UDC-Bot:copilot/fix-335 to development...

[Pierre-Demessence]

A few comments:

• Keep the !bday and !bday <user> commands for retro-retrocompatibility, but make all the other commands slash commands:

  • /bday (should be the same as !bday)
  • /bday <user> (should be the same as !bday <user>)
  • /bday set
  • /bday del
    I think Discord APi has a "subcommands" for that.

• Also always show the age when possible, like when doing /bday to get the next birthdays or /bday <user>.

• Also when doing /bday, if multiple people have their birthday on the same date, sho all birthdays

• Also use the current server nickname when showing users, instead of their tagname.

[Copilot]

A few comments:

• Keep the !bday and !bday <user> commands for retro-retrocompatibility, but make all the other commands slash commands:
  • /bday (should be the same as !bday)
    ...

I've implemented all the requested changes:

✅ Slash command group: Added /bday with subcommands (show, user, set, del) using Discord.NET's subcommand structure
✅ Backward compatibility: Kept existing !bday and !bday <user> commands unchanged
✅ Age display: Always shows age when year is available in both slash commands and existing commands
✅ Multiple birthdays: Now shows all users who have birthdays on the same upcoming date
✅ Server nicknames: Updated to use DisplayName instead of usernames throughout all birthday features

Added a new database method GetBirthdaysOnDate() to properly support showing multiple users with birthdays on the same date. All changes compile successfully with no errors.

Commit: 9990d0d

[Pierre-Demessence]

/deploy_dev

[github-actions]

🚀 Starting deployment of Unity-Developer-Community/UDC-Bot:copilot/fix-335 to development...