🔢 feat(user-edit): replace add-quota input with Semi-UI InputNumber

Summary:
• Imported InputNumber from @douyinfe/semi-ui.
• Swapped plain Input for InputNumber in “Add Quota” modal.
• Added UX tweaks: full-width styling, showClear, step = 500 000.
• Initialized addQuotaLocal to an empty string so the field starts blank.
• Adjusted state handling and kept quota calculation logic unchanged.

This improves numeric input accuracy and overall user experience without breaking existing functionality.

web/src/i18n/locales/en.json

@@ -1199,7 +1199,7 @@
   "添加用户": "Add user",
   "角色": "Role",
   "已绑定的 Telegram 账户": "Bound Telegram account",
-  "新额度": "New quota",
+  "新额度：": "New quota: ",
   "需要添加的额度（支持负数）": "Need to add quota (supports negative numbers)",
   "此项只读，需要用户通过个人设置页面的相关绑定按钮进行绑定，不可直接修改": "Read-only, user's personal settings, and cannot be modified directly",
   "请输入新的密码，最短 8 位": "Please enter a new password, at least 8 characterss",