[refactor] Bulk actions

[SchrodingersGat]

Implement helper functions for bulk offloading of background tasks and events:

• Add bulk_create helper for background tasks
• Add bulk_create helper for events

Also, add context wrappers to automatically extract common operations from deeply nested loops:

• Capture tasks, and pass them to bulk_offload_task
• Capture events, and pass them to bulk_trigger_event
• Capture stock tracking entries and bulk create them

Performance Benchmarks

• Performing bulk API operations with the specified number of entries
• Record number of database operations before and after batching
• 100x items used in each case

Endpoint	Before	After	Reduction
/stock/count/	2,618	2,019	600
/stock/add/	2,618	2,019	600
/stock/remove/	2,618	2,019	600
/stock/move/	1,619	1,120	500

Note: There are some other major improvement opportunities identified here, these will be addressed in a follow-up PR

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[codecov]

Codecov Report

❌ Patch coverage is 97.76423% with 11 lines in your changes missing coverage. Please review.
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Flag	BASE (4e00e2d)	HEAD (20b4b62)
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Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12359      +/-   ##
==========================================
- Coverage   86.86%   81.35%   -5.51%     
==========================================
  Files        1399     1379      -20     
  Lines       92225    90471    -1754     
  Branches    10720    10077     -643     
==========================================
- Hits        80108    73600    -6508     
- Misses      12054    16810    +4756     
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Components	Coverage Δ
Backend Apps	92.43% <98.53%> (+0.04%)	⬆️
Backend General	93.38% <ø> (ø)
Frontend	65.57% <ø> (-14.36%)	⬇️

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