refactor: rewrite lockdown command

[kyranet]

Changelog

• Rewrite to slash (/lockdown).
• Added global lockdown.
• Added support for locking thread, category, and voice channels.
• Added persistence for temporary lockdowns.
• Increased maximum lockdown duration from 6 hours to 1 month.
• Improved permissions restore in unlock.
• Tweaked the permissions modified by the command, from Send Messages to:
  • Text-based:
    • Send Messages
    • Send Messages in Threads
    • Create Public Threads
    • Create Private Threads
  • Voice-based:
    • Connect
  • Mixed and categories:
    • All of the previous.

[codecov]

Codecov Report

Attention: Patch coverage is 32.62411% with 95 lines in your changes missing coverage. Please review.

Project coverage is 72.56%. Comparing base (3400b53) to head (69dc1c1).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/schedule/manager/ScheduleEntry.ts	0.00%	78 Missing ⚠️
src/lib/schedule/structures/Task.ts	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2593      +/-   ##
==========================================
- Coverage   73.93%   72.56%   -1.38%     
==========================================
  Files          91       92       +1     
  Lines        4059     4195     +136     
  Branches      290      209      -81     
==========================================
+ Hits         3001     3044      +43     
- Misses       1053     1146      +93     
  Partials        5        5              

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