backend: Prioritize YAML config over .env config

[tianjing-li]

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AI Description

This PR introduces a change to the settings_customise_sources function in the src/backend/config/settings.py file. The function now includes an additional dotenv_settings parameter, which is inserted between the env_settings and YamlConfigSettingsSource parameters.

Changes:

• The dotenv_settings parameter is added to the settings_customise_sources function.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.75%. Comparing base (3b1c27f) to head (0b52b3a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #916   +/-   ##
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  Coverage   76.75%   76.75%           
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  Files         272      272           
  Lines       10638    10638           
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  Hits         8165     8165           
  Misses       2473     2473           

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[EugeneLightsOn]

Looks good to me. Just one comment - I think we should add some explanation to the documentation about the priority.

[tianjing-li]

Deprioritizing this