[FEAT] 優化客戶合約管理介面與修復日期偏移問題

1. 整合「客戶詳情」與「合約歷程」至單一側邊欄，改用分頁 (Tabs) 切換介面。
2. 優化清單「服務期程」顯示：根據客戶模式（租賃/買斷）動態顯示對應期間，並使用完整文字標籤取代縮寫。
3. 修復日期 Bug：在 Company 模型指定日期序列化格式為 Y-m-d，解決時區轉換導致的日期減少一天問題。
4. 新增合約歷程資料表模型、遷移檔以及對應的多語系翻譯（中、英、日）。
5. 移除清單操作列中重複的合約歷程圖示。

lang/zh_TW.json

@@ -677,7 +677,7 @@
     "Pending": "等待機台領取",
     "pending": "等待機台領取",
     "Performance": "效能 (Performance)",
-    "Permanent": "永久授權",
+    "Permanent": "永久",
     "Permanently Delete Account": "永久刪除帳號",
     "Permission Settings": "權限設定",
     "Permissions": "權限",
@@ -1119,5 +1119,31 @@
     "Model changed to :model": "型號變更：:model",
     "User logged in: :name": "使用者登入：:name",
     "Login failed: :account": "登入失敗：:account",
-    "Unauthorized login attempt: :account": "越權登入嘗試：:account"
+    "Unauthorized login attempt: :account": "越權登入嘗試：:account",
+    "Contract Model": "合約模式",
+    "Warranty Service": "保固服務",
+    "Software Service": "軟體服務",
+    "Modification History": "異動歷程",
+    "No history records": "尚無歷史紀錄",
+    "Initial contract registration": "初始合約註冊",
+    "Contract information updated": "合約資訊已更新",
+    "Warranty Start": "保固起始",
+    "Warranty End": "保固結束",
+    "Software Start": "軟體起始",
+    "Software End": "軟體結束",
+    "Contract History": "合約歷程",
+    "Unlimited": "無限期",
+    "Change Note": "異動備註",
+    "Log Time": "記錄時間",
+    "Service Periods": "服務區間",
+    "Creator": "建立者",
+    "View Full History": "查看完整歷程",
+    "Contract Start": "合約起始",
+    "Contract End": "合約結束",
+    "Contract History Detail": "合約歷程詳情",
+    "by": "由",
+    "Service Terms": "服務期程",
+    "Contract": "合約",
+    "Warranty": "保固",
+    "Software": "軟體"
 }