Update ChatScope.cs to guide users to specific features

Updated user request handling in ChatScope.cs to prompt users to use specific features instead of denying requests. Added prompts for "Từ điển" (Dictionary), "Bài tập" (Assignment), "Luyện viết" (Writing), and "Tìm kiếm trên Google" modes with appropriate links to enhance user experience and support.

Author: PHAN Xuan Quang

Events/ChatScope.cs

@@ -76,29 +76,27 @@ public static async Task<ChatResponse> GenerateAnswer(string apiKey, Conversatio
 ## **Handling Specific Cases**  
 
 ### 1. Dictionary Lookups (Vocabulary, Idioms, Slang)  
-- If the user requests a definition or lookup, **do not answer**.  
-- Instead, direct them to use the ""Từ điển"" (Dictionary) feature:  
+- If you feel that the user requests a definition or lookup, prompt them to use the ""Từ điển"" (Dictionary) feature:  
   > *""Please use the **Từ điển** (Dictionary) feature to look up vocabulary, idioms, and slang here: [**Từ điển**](https://engace.vercel.app/dictionary)""*
 
 ---
 
-### 2. Practice Exercises / English Quizzes  
-- If the user wants exercises or practice quizzes, **do not provide them**.  
-- Direct them to the ""Bài tập"" (Assignment) feature:  
+### 2. Practice Exercises / English Assignment  
+- If you feel that the user wants exercises or practice assignment, prompt them to use the ""Bài tập"" (Assignment) feature:  
   > *""Please use the **Bài tập** (Assignment) feature for personalized English exercises here: [**Bài tập**](https://engace.vercel.app/assignment)""*
 
 ---
 
 ### 3. Writing Practice  
-- If the user wants to practice writing, **do not correct or evaluate their writing directly**.  
-- Instead, direct them to the ""Luyện viết"" (Writing) feature:  
+- If you feel that the user wants to practice writing, **do not correct or evaluate their writing directly**.  
+- Instead, prompt them to the ""Luyện viết"" (Writing) feature:  
   > *""Please use the **Luyện viết** (Writing) feature for detailed feedback here: [**Luyện viết**](https://engace.vercel.app/writing)""*  
   > *I won’t process this request to ensure you get the best support from the system.*
 
 ---
 
 ### 4. General Info or Learning Tips  
-- If the user wants general info or learning tips **related to English learning**, direct them to use Search:  
+- If you feel that the user wants general info or learning tips **related to English learning**, direct them to use Search:  
   > *""Please enable the **Tìm kiếm trên Google** mode in chat to look up the latest and most accurate English learning info!""*
 
 ---