Fix settings_global API documentation: separate GET and POST paths

[Copilot]

The OpenAPI spec incorrectly documented both GET and POST operations under /settings_global.json, but the actual implementation uses different paths.

Changes

• Split /settings_global.json path to contain only the GET operation
• Created separate /settings_global path for the POST operation

Implementation vs Documentation

Actual endpoints (script/rvd_front):

get '/settings_global.json' => sub($c) {  # Line 405
    return $c->render(json => $RAVADA->settings_global );
};

post '/settings_global' => sub($c) {      # Line 410
    $RAVADA->update_settings_global($arg, $USER, \$reload);
    return $c->render(json => { ok => 1, reload => $reload });
};

The OpenAPI spec now matches this implementation with two distinct path entries.

Original prompt

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This section details on the original issue you should resolve

<issue_title>FIX settings_global API doc</issue_title>
<issue_description>In the openapi.yaml file:

The POST endpoint path is incorrect. According to script/rvd_front line 410, the POST endpoint is /settings_global (without .json suffix), but the OpenAPI spec documents it as /settings_global.json. The GET endpoint at line 405 correctly uses /settings_global.json. These should be documented as two separate paths: /settings_global.json (GET only) and /settings_global (POST only).
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes FIX settings_global API doc #2279

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[Copilot]

Pull request overview

This PR corrects the OpenAPI specification to accurately document the two distinct endpoints for global settings, aligning the documentation with the actual implementation in script/rvd_front.

Changes:

• Separated /settings_global.json path definition to contain only the GET operation (retrieves global settings)
• Created a new /settings_global path definition for the POST operation (updates global settings)

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