Fix SSE handler generation to use correct template file

The issue was that SSE handlers were incorrectly using handler.tpl instead of sse_handler.tpl, causing the wrong handler pattern to be generated when custom templates were present. This fix ensures SSE handlers and logic use their dedicated template files (sse_handler.tpl and sse_logic.tpl) when SSE annotation is enabled.

Co-authored-by: kevwan <1918356+kevwan@users.noreply.github.com>

tools/goctl/api/gogen/jwt.api

@@ -1,17 +0,0 @@
-type Request {
-	Name string `path:"name,options=you|me"`
-}
-
-type Response {
-	Message string `json:"message"`
-}
-
-@server(
-	jwt: Auth
-	jwtTransition: Trans
-	middleware: TokenValidate
-)
-service A-api {
-	@handler GreetHandler
-	get /greet/from/:name(Request) returns (Response)
-}