test: improve integration test error reporting for library creation

- Add explicit status code check (require.Equal 201)
- Remove conditional success/failure branching
- Provide clear error message with actual vs expected status

Now if CreateLibrary returns 500, test will clearly show:
"Failed to create library: expected 201, got 500"

Instead of vague "Library ID is empty" message that hid the 500 error.

cmd/server/tests/integration_test.go

@@ -285,16 +285,14 @@ func setupTestSuite(t *testing.T) *TestContext {
 		resp = makeRequest(t, "POST", "/api/libraries", libReq, ctx.AdminToken)
 		defer resp.Body.Close()
 
-		if resp.StatusCode == http.StatusCreated || resp.StatusCode == http.StatusOK {
-			var lib map[string]interface{}
-			body, _ := io.ReadAll(resp.Body)
-			err := json.Unmarshal(body, &lib)
-			require.NoError(t, err)
+		require.Equal(t, http.StatusCreated, resp.StatusCode, "Failed to create library")
 
-			ctx.LibraryID = lib["id"].(string)
-			t.Logf("Created new library: %v", lib["name"])
-		}
+		var lib map[string]interface{}
+		body, _ := io.ReadAll(resp.Body)
+		err := json.Unmarshal(body, &lib)
+		require.NoError(t, err)
 
+		ctx.LibraryID = lib["id"].(string)
 		require.NotEmpty(t, ctx.LibraryID, "Library ID is empty")
 	})