refactor : free chat

src/main/java/com/investment/findfriend/domain/chat/presentation/ChatController.java

@@ -32,7 +32,7 @@ public ResponseEntity<List<ChatResponse>> getListChat(@RequestParam Long id, Htt
         return getListChatService.execute(id, httpServletRequest);
     }
 
-    @GetMapping("/free")
+    @PostMapping("/free")
     public ResponseEntity<GenerateChatResponse> freeChat(@RequestBody ChatRequest request) {
         return freeChatService.execute(request);
     }