Enhance feature flag examples and clean up test files

- Add retrieval examples for feature flags "teste3" with valid and invalid session IDs in both FEATURE_FLAG.md and main.go.
- Remove unnecessary blank lines in contenthub_dto_test.go and featureflag_dto_test.go for cleaner code.

Author: IsaacDSC

docs/FEATURE_FLAG.md

@@ -84,12 +84,17 @@ func main() {
 		test1, err := ff.GetFeatureFlag("teste1").Err()
 		fmt.Println("@@@ teste1: ", test1, err)
 
+		test3, err := ff.GetFeatureFlag("teste3", "34eec623-c9f2-494e-bf66-57a85139fd69").Err()
+		fmt.Println("@@@ teste3: ", test3, err)
+
+		test4, err := ff.GetFeatureFlag("teste3", "not-found-session-id").Err()
+		fmt.Println("@@@ teste4: ", test4, err)
+
 		w.WriteHeader(http.StatusOK)
 	})
 
 	if err := http.ListenAndServe(":8080", nil); err != nil {
 		panic(err)
 	}
 }
-
 ```

example/featureflag/main.go

@@ -36,6 +36,12 @@ func main() {
 		test1, err := ff.GetFeatureFlag("teste1").Err()
 		fmt.Println("@@@ teste1: ", test1, err)
 
+		test3, err := ff.GetFeatureFlag("teste3", "34eec623-c9f2-494e-bf66-57a85139fd69").Err()
+		fmt.Println("@@@ teste3: ", test3, err)
+
+		test4, err := ff.GetFeatureFlag("teste3", "not-found-session-id").Err()
+		fmt.Println("@@@ teste4: ", test4, err)
+
 		w.WriteHeader(http.StatusOK)
 	})
 

internal/contenthub/contenthub_dto_test.go

@@ -393,5 +393,3 @@ func TestFromDomain_PreservesAllFields(t *testing.T) {
 		t.Error("CreatedAt not properly preserved")
 	}
 }
-
-

internal/featureflag/featureflag_dto_test.go

@@ -266,4 +266,3 @@ func TestDtoFromDomain(t *testing.T) {
 		})
 	}
 }
-