add web init with uiconfig file path, add cli flag

web/web.go

@@ -11,7 +11,9 @@ import (
 	"encoding/json"
 	"html/template"
 	"io/fs"
+	"log"
 	"net/http"
+	"os"
 	"strings"
 
 	"github.com/ClusterCockpit/cc-backend/internal/config"
@@ -115,9 +117,18 @@ var UIDefaultsMap map[string]any
 // 	"status_view_selectedTopProjectCategory": "totalJobs",
 // }
 
-func Init(rawConfig json.RawMessage) error {
-	var err error
+func Init(configFilePath string) error {
+	var rawConfig json.RawMessage = nil
+	raw, rerr := os.ReadFile(configFilePath)
+	if rerr != nil {
+		if !os.IsNotExist(rerr) {
+			log.Fatalf("UI-CONFIG ERROR: %v", rerr)
+		}
+	} else {
+		rawConfig = json.RawMessage(raw)
+	}
 
+	var err error
 	if rawConfig != nil {
 		config.Validate(configSchema, rawConfig)
 		if err = json.Unmarshal(rawConfig, &UIDefaults); err != nil {