feat: Add file name display in WebUI

Backend:
- Add file_path field to DocStatusResponse
- Update document status response creation

Frontend:
- Remove metadata column
- Improve filename display with truncation and tooltips
- Add show/hide filename toggle with proper styling
- Update translations for all supported languages"

lightrag_webui/src/locales/ar.json

@@ -81,9 +81,14 @@
       },
       "errors": {
         "loadFailed": "فشل تحميل المستندات\n{{error}}",
-        "scanFailed": "فشل المسح الضوئي للمستندات\n{{error}}",
-        "scanProgressFailed": "فشل الحصول على تقدم المسح الضوئي\n{{error}}"
-      }
+        "scanFailed": "فشل مسح المستندات\n{{error}}",
+        "scanProgressFailed": "فشل الحصول على تقدم المسح\n{{error}}"
+      },
+      "fileNameLabel": "اسم الملف",
+      "showButton": "عرض",
+      "hideButton": "إخفاء",
+      "showFileNameTooltip": "عرض اسم الملف",
+      "hideFileNameTooltip": "إخفاء اسم الملف"
     }
   },
   "graphPanel": {

lightrag_webui/src/locales/en.json

@@ -83,7 +83,12 @@
         "loadFailed": "Failed to load documents\n{{error}}",
         "scanFailed": "Failed to scan documents\n{{error}}",
         "scanProgressFailed": "Failed to get scan progress\n{{error}}"
-      }
+      },
+      "fileNameLabel": "File Name",
+      "showButton": "Show",
+      "hideButton": "Hide",
+      "showFileNameTooltip": "Show file name",
+      "hideFileNameTooltip": "Hide file name"
     }
   },
   "graphPanel": {

lightrag_webui/src/locales/zh.json

@@ -83,7 +83,12 @@
         "loadFailed": "加载文档失败\n{{error}}",
         "scanFailed": "扫描文档失败\n{{error}}",
         "scanProgressFailed": "获取扫描进度失败\n{{error}}"
-      }
+      },
+      "fileNameLabel": "文件名",
+      "showButton": "显示",
+      "hideButton": "隐藏",
+      "showFileNameTooltip": "显示文件名",
+      "hideFileNameTooltip": "隐藏文件名"
     }
   },
   "graphPanel": {