refactor: move PageWatermarkConfig interface to dedicated types file

feat(i18n): add missing translations for 5 languages
- be: common.close, upload.clearFiles
- zh: addStamps username fields
- zh-TW, tr, pt: compressPdf compression settings

public/locales/zh-TW/tools.json

@@ -22,7 +22,29 @@
   },
   "compressPdf": {
     "name": "壓縮 PDF",
-    "subtitle": "降低你的 PDF 檔案大小。"
+    "subtitle": "降低你的 PDF 檔案大小。",
+    "algorithmLabel": "壓縮演算法",
+    "condense": "Condense（推薦）",
+    "photon": "Photon（適用於圖片較多的 PDF）",
+    "condenseInfo": "Condense 使用高級壓縮：移除冗餘資料、優化圖片、精簡字型。適用於大多數 PDF。",
+    "photonInfo": "Photon 將頁面轉換為圖片。適用於圖片較多/掃描的 PDF。",
+    "photonWarning": "警告：文字將無法選取，連結將失效。",
+    "levelLabel": "壓縮等級",
+    "light": "輕度（保持品質）",
+    "balanced": "平衡（推薦）",
+    "aggressive": "積極（更小檔案）",
+    "extreme": "極限（最大壓縮）",
+    "grayscale": "轉換為灰階",
+    "grayscaleHint": "透過移除色彩資訊來縮小檔案大小",
+    "customSettings": "自訂設定",
+    "customSettingsHint": "微調壓縮參數：",
+    "outputQuality": "輸出品質",
+    "resizeImagesTo": "調整圖片至",
+    "onlyProcessAbove": "僅處理高於",
+    "removeMetadata": "移除中繼資料",
+    "subsetFonts": "精簡字型（移除未使用的字符）",
+    "removeThumbnails": "移除嵌入的縮圖",
+    "compressButton": "壓縮 PDF"
   },
   "pdfEditor": {
     "name": "PDF 編輯器",