VPR-188 feat(deploy): set the Hangfire shutdown timeout chain explicitly

[rlorenzo]

• Hangfire 15s <= host 30s <= IIS shutdownTimeLimit 90s, matching the
  defaults that were previously implicit
• A slot flip stops a pool mid-drain, so each link must leave the next
  room to finish a job rather than cut it off and re-queue it
• The IIS link is app pool config and ships with the two-slot layout

---

_{Stack created with GitHub Stacks CLI • Give Feedback 💬}

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.37%. Comparing base (6ab4555) to head (eb54f77).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
web/Classes/Scheduler/HangfireExtensions.cs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                             Coverage Diff                              @@
##           feature/VPR-187-data-protection-key-ring     #344      +/-   ##
============================================================================
- Coverage                                     45.38%   45.37%   -0.01%     
============================================================================
  Files                                           949      949              
  Lines                                         49546    49547       +1     
  Branches                                       6702     6703       +1     
============================================================================
  Hits                                          22484    22484              
- Misses                                        26095    26096       +1     
  Partials                                        967      967              

Flag	Coverage Δ
backend	42.34% <0.00%> (-0.01%)	⬇️
frontend	64.68% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
web/Classes/Scheduler/HangfireExtensions.cs	0.00% <0.00%> (ø)

[codecov-commenter]

Bundle Report

Bundle size has no change ✅