[Advanced Paste] Don't hardcode reasoning_effort=minimal for OpenAI p… (#49840)

…roviders

PR #46727 added `ReasoningEffort = "minimal"` to
OpenAIPromptExecutionSettings in
SemanticKernelPasteProvider.CreateExecutionSettings(). The value is not
user-configurable, so every OpenAI/Azure OpenAI request now fails on
models that don't accept 'minimal':

HTTP 400 (invalid_request_error: unsupported_value) Parameter:
reasoning_effort
Unsupported value: 'reasoning_effort' does not support 'minimal' with
this
  model. Supported values are: 'medium'.

This is the same class of regression PR #43766 previously fixed by
removing hardcoded Temperature/tuning properties. Remove the property so
the service default applies, and add a comment to prevent it being
reintroduced.

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/modules/AdvancedPaste/AdvancedPaste/Services/CustomActions/SemanticKernelPasteProvider.cs

@@ -172,10 +172,12 @@ namespace AdvancedPaste.Services.CustomActions
         {
             return _serviceType switch
             {
+                // Do not set model-specific tuning properties such as ReasoningEffort here: models
+                // accept different value sets (or reject the parameter outright) and any hardcoded
+                // value makes every request fail with HTTP 400 on models that don't support it.
                 AIServiceType.OpenAI or AIServiceType.AzureOpenAI => new OpenAIPromptExecutionSettings
                 {
                     FunctionChoiceBehavior = null,
-                    ReasoningEffort = "minimal",
                 },
                 _ => new PromptExecutionSettings(),
             };