Join Record Replay improvements

[WillNilges]

• Small refactoring of the replay system
• some better logs
• adds a simple web interface for viewing join records
• inject join record env vars into container

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 94.80%. Comparing base (8037c42) to head (8559196).

Files with missing lines	Patch %	Lines
src/meshapi/util/join_records.py	75.00%	5 Missing ⚠️

❌ Your patch check has failed because the patch coverage (75.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #836      +/-   ##
==========================================
- Coverage   94.92%   94.80%   -0.12%     
==========================================
  Files          90       90              
  Lines        3841     3853      +12     
==========================================
+ Hits         3646     3653       +7     
- Misses        195      200       +5     

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