fix(search): return user error when disabled engines are received ins…

…tead of ignoring

src/router/routes/route_search_images.go

@@ -121,7 +121,14 @@ func routeSearchImages(w http.ResponseWriter, r *http.Request, ver string, disab
 			Value:   fmt.Sprintf("%v", err),
 		})
 	}
-	catConf.DisableEngines(disabledEngines)
+
+	if catConf.ContainsDisabledEngines(disabledEngines) {
+		// User error.
+		return writeResponseJSON(w, http.StatusBadRequest, ErrorResponse{
+			Message: "category contains disabled engines",
+			Value:   "disabled engines",
+		})
+	}
 
 	// All of these have default values set and validated.
 	opts := options.Options{

src/router/routes/route_search_suggestions.go

@@ -78,7 +78,14 @@ func routeSearchSuggestions(w http.ResponseWriter, r *http.Request, ver string,
 			Value:   fmt.Sprintf("%v", err),
 		})
 	}
-	catConf.DisableEngines(disabledEngines)
+
+	if catConf.ContainsDisabledEngines(disabledEngines) {
+		// User error.
+		return writeResponseJSON(w, http.StatusBadRequest, ErrorResponse{
+			Message: "category contains disabled engines",
+			Value:   "disabled engines",
+		})
+	}
 
 	// All of these have default values set and validated.
 	opts := options.Options{

src/router/routes/route_search_web.go

@@ -121,7 +121,14 @@ func routeSearchWeb(w http.ResponseWriter, r *http.Request, ver string, disabled
 			Value:   fmt.Sprintf("%v", err),
 		})
 	}
-	catConf.DisableEngines(disabledEngines)
+
+	if catConf.ContainsDisabledEngines(disabledEngines) {
+		// User error.
+		return writeResponseJSON(w, http.StatusBadRequest, ErrorResponse{
+			Message: "category contains disabled engines",
+			Value:   "disabled engines",
+		})
+	}
 
 	// All of these have default values set and validated.
 	opts := options.Options{

src/search/category/disabled.go

@@ -0,0 +1,19 @@
+package category
+
+import (
+	"slices"
+
+	"github.com/hearchco/agent/src/search/engines"
+)
+
+// Returns true if the category contains any disabled engines.
+// Otherwise, returns false.
+func (c Category) ContainsDisabledEngines(disabledEngines []engines.Name) bool {
+	for _, eng := range disabledEngines {
+		if slices.Contains(c.Engines, eng) {
+			return true
+		}
+	}
+
+	return false
+}