[CHANGE] Switch to OpenAPI and Refator

[ppfeufer]

Description

Added

• Loading spinner to DataTable while loading data via AJAX

Changed

• Switch to OpenAPI3 based ESI client
  • Set ESI compatibility date to 2025-08-26 (August 26, 2025)
• Improved logging for the sovereignty structures task
• JavaScript optimized
• Set maximum required Python version to 3.13

Type of Change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

❌ Patch coverage is 96.84211% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.56%. Comparing base (1bb0ffd) to head (ea59417).
⚠️ Report is 56 commits behind head on master.

Files with missing lines	Patch %	Lines
sovtimer/tasks.py	94.45%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #212       +/-   ##
===========================================
+ Coverage   58.52%   98.56%   +40.04%     
===========================================
  Files          10       10               
  Lines         270      277        +7     
  Branches       20       18        -2     
===========================================
+ Hits          158      273      +115     
+ Misses        107        1      -106     
+ Partials        5        3        -2     

Files with missing lines	Coverage Δ
sovtimer/__init__.py	100.00% <100.00%> (ø)
sovtimer/apps.py	100.00% <100.00%> (ø)
sovtimer/auth_hooks.py	100.00% <100.00%> (+12.50%)	⬆️
sovtimer/constants.py	100.00% <ø> (ø)
sovtimer/models.py	100.00% <100.00%> (+20.69%)	⬆️
sovtimer/providers.py	100.00% <100.00%> (ø)
sovtimer/tasks.py	96.35% <94.45%> (+96.35%)	⬆️

... and 1 file with indirect coverage changes

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