Moved all extension methods into extension blocks (#1155)

app/MindWork AI Studio/Chat/ChatThreadExtensions.cs

@@ -2,24 +2,27 @@ namespace AIStudio.Chat;
 
 public static class ChatThreadExtensions
 {
-    /// <summary>
-    /// Checks if the specified provider is allowed for the chat thread.
-    /// </summary>
-    /// <remarks>
-    /// A provider the organization prohibited is never allowed, whatever the chat thread.<br/><br/>
-    ///
-    /// We don't check if the provider is allowed to use the data sources of the chat thread.
-    /// That kind of check is done when the available data sources are resolved.<br/><br/>
-    ///
-    /// One thing which is not so obvious: after RAG was used on this thread, the entire chat
-    /// thread is kind of a data source by itself. Why? Because the augmentation data collected
-    /// from the data sources is stored in the chat thread. This means we must check if the
-    /// selected provider is allowed to use this thread's data security and confidence level.
-    /// The check itself is ChatRestrictionsExtensions.IsLLMProviderAllowed, which content that left
-    /// the thread is checked with as well.
-    /// </remarks>
     /// <param name="chatThread">The chat thread to check; null for a new chat, which demands nothing yet.</param>
-    /// <param name="provider">The provider to check.</param>
-    /// <returns>True, when the provider is allowed for the chat thread. False, otherwise.</returns>
-    public static bool IsLLMProviderAllowed<T>(this ChatThread? chatThread, T provider) => (chatThread?.CaptureRestrictions() ?? ChatRestrictions.NONE).IsLLMProviderAllowed(provider);
+    extension(ChatThread? chatThread)
+    {
+        /// <summary>
+        /// Checks if the specified provider is allowed for the chat thread.
+        /// </summary>
+        /// <remarks>
+        /// A provider the organization prohibited is never allowed, whatever the chat thread.<br/><br/>
+        ///
+        /// We don't check if the provider is allowed to use the data sources of the chat thread.
+        /// That kind of check is done when the available data sources are resolved.<br/><br/>
+        ///
+        /// One thing which is not so obvious: after RAG was used on this thread, the entire chat
+        /// thread is kind of a data source by itself. Why? Because the augmentation data collected
+        /// from the data sources is stored in the chat thread. This means we must check if the
+        /// selected provider is allowed to use this thread's data security and confidence level.
+        /// The check itself is ChatRestrictionsExtensions.IsLLMProviderAllowed, which content that left
+        /// the thread is checked with as well.
+        /// </remarks>
+        /// <param name="provider">The provider to check.</param>
+        /// <returns>True, when the provider is allowed for the chat thread. False, otherwise.</returns>
+        public bool IsLLMProviderAllowed<T>(T provider) => (chatThread?.CaptureRestrictions() ?? ChatRestrictions.NONE).IsLLMProviderAllowed(provider);
+    }
 }