refactor(http.go): replace hardcoded "remote" string with the AppID f…

…rom the configuration file to improve semantics and readability

test(test.http): update the test request to use the new AppID-based URL instead of the hardcoded "remote" string

services/gateway/http.go

@@ -31,7 +31,7 @@ func NewHTTPServer(cfg Config) error {
 	client := req.C().
 		SetBaseURL(fmt.Sprintf("http://localhost:%d", cfg.Dapr.HTTPPort)).
 		WrapRoundTripFunc(
-			helpers.NewClientAppMiddleware("remote"),
+			helpers.NewClientAppMiddleware(cfg.Integration.AppID),
 			helpers.NewClientTraceMiddleware(),
 			helpers.NewClientLoggerMiddleware(),
 		)

test.http

@@ -51,3 +51,8 @@ Content-Type: {{contentType}}
     "token": "{{token}}"
 }
 
+###
+
+# @name gateway
+POST {{remote}}/gateway HTTP/1.1
+Content-Type: {{contentType}}