feat(inbounds): clearer client validation errors on save

When an inbound save fails Zod validation, the toast previously showed a
raw path like `settings.clients.494.tgId: Invalid input`, which gave no
hint which of hundreds of clients was at fault. Resolve the client array
index back to the client email, name the field, and append a "(+N more)"
count when several fields fail. console.error now logs a readable list of
every issue instead of dumping the whole form.

Adds the invalidClientField/invalidField/moreIssues toast strings across
all 13 translations.

web/translation/zh-TW.json

@@ -442,7 +442,10 @@
         "trafficGetError": "取得流量資料時發生錯誤",
         "getNewX25519CertError": "取得X25519憑證時發生錯誤。",
         "getNewmldsa65Error": "取得mldsa65憑證時發生錯誤。",
-        "getNewVlessEncError": "取得VlessEnc憑證時發生錯誤。"
+        "getNewVlessEncError": "取得VlessEnc憑證時發生錯誤。",
+        "invalidClientField": "用戶端 {client}：欄位 {field} — {reason}",
+        "invalidField": "{field} — {reason}",
+        "moreIssues": "{message}  (另有 {count} 項)"
       },
       "form": {
         "moveUp": "上移",