Limit the size of files to calculate hash

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 32.53%. Comparing base (92ef155) to head (1267b33).

Files	Patch %	Lines
server/handler/file_api_handler.go	0.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #359 +/- ## ========================================== - Coverage 32.56% 32.53% -0.04% ========================================== Files 133 133 Lines 6053 6059 +6 ========================================== Hits 1971 1971 - Misses 3991 3997 +6 Partials 91 91 ```

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