Add menu foreign key to station + stuff on item

[vcai122]

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[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.23%. Comparing base (e7d0dc7) to head (b762c24).
Report is 3 commits behind head on master.

Files	Patch %	Lines
backend/dining/models.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
- Coverage   90.70%   89.23%   -1.48%     
==========================================
  Files          61       60       -1     
  Lines        2604     2600       -4     
==========================================
- Hits         2362     2320      -42     
- Misses        242      280      +38     

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