refactor(settings): shorten folder settings labels for better readability

- Rename section title: 'Folder Settings' → 'Default Roots'
- Remove 'Default' prefix from root directory labels:
  - 'Default LoRA Root' → 'LoRA Root'
  - 'Default Checkpoint Root' → 'Checkpoint Root'
  - 'Default Diffusion Model Root' → 'Diffusion Model Root'
  - 'Default Embedding Root' → 'Embedding Root'
- Update translations for all supported languages (en, zh-CN, zh-TW, ja, ko, ru, de, fr, es, he)

locales/zh-TW.json

@@ -259,7 +259,7 @@
             "contentFiltering": "內容過濾",
             "videoSettings": "影片設定",
             "layoutSettings": "版面設定",
-            "folderSettings": "資料夾設定",
+            "folderSettings": "預設根目錄",
             "priorityTags": "優先標籤",
             "downloadPathTemplates": "下載路徑範本",
             "exampleImages": "範例圖片",
@@ -355,13 +355,13 @@
             "activeLibraryHelp": "在已設定的資料庫之間切換以更新預設資料夾。變更選項會重新載入頁面。",
             "loadingLibraries": "正在載入資料庫...",
             "noLibraries": "尚未設定任何資料庫",
-            "defaultLoraRoot": "預設 LoRA 根目錄",
+            "defaultLoraRoot": "LoRA 根目錄",
             "defaultLoraRootHelp": "設定下載、匯入和移動時的預設 LoRA 根目錄",
-            "defaultCheckpointRoot": "預設 Checkpoint 根目錄",
+            "defaultCheckpointRoot": "Checkpoint 根目錄",
             "defaultCheckpointRootHelp": "設定下載、匯入和移動時的預設 Checkpoint 根目錄",
-            "defaultUnetRoot": "預設 Diffusion Model 根目錄",
+            "defaultUnetRoot": "Diffusion Model 根目錄",
             "defaultUnetRootHelp": "設定下載、匯入和移動時的預設 Diffusion Model (UNET) 根目錄",
-            "defaultEmbeddingRoot": "預設 Embedding 根目錄",
+            "defaultEmbeddingRoot": "Embedding 根目錄",
             "defaultEmbeddingRootHelp": "設定下載、匯入和移動時的預設 Embedding 根目錄",
             "noDefault": "未設定預設"
         },