Tech: ajoute un cache http sur la page de stats

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.89%. Comparing base (4e1e189) to head (ea799d4).

Files with missing lines	Patch %	Lines
app/controllers/stats_controller.rb	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10773 +/- ## ========================================== - Coverage 84.66% 83.89% -0.78% ========================================== Files 1124 1124 Lines 24917 24952 +35 Branches 4634 4624 -10 ========================================== - Hits 21097 20933 -164 - Misses 3820 4019 +199 ```

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