[Feature]: Add a tooltip/hint to the "Password" field in the client form clarifying which protocols use it (#5809)

* feat(clients): clarify which protocols use the Password and Hysteria Auth fields

Add tooltips to the Password and Hysteria Auth Form.Items in the client
form, explaining that Password is only consumed by Trojan and Shadowsocks
(ignored for VLESS, VMess, Hysteria, WireGuard) and that Hysteria Auth is
the credential Hysteria actually uses. Adds passwordDesc/hysteriaAuthDesc
keys to all 13 locale files, following the existing limitIpDesc/totalGBDesc
tooltip convention.

Closes #5803

* test(clients): assert Password/Hysteria Auth tooltip hints render

internal/web/translation/zh-CN.json

@@ -806,6 +806,7 @@
       "limitIpFail2banWindows": "Windows 上不支持 Fail2ban，无法实施 IP 限制。",
       "limitIpDisabled": "此服务器已禁用 IP 限制功能。",
       "password": "密码",
+      "passwordDesc": "仅 Trojan 和 Shadowsocks 客户端使用；VLESS、VMess、Hysteria 和 WireGuard 会忽略此项。",
       "subId": "订阅 ID",
       "online": "在线",
       "email": "邮箱",
@@ -906,6 +907,7 @@
       "delOrphansConfirmContent": "删除所有未关联到任何入站的客户端及其流量记录。该操作不可撤销。",
       "auth": "认证",
       "hysteriaAuth": "Hysteria 认证",
+      "hysteriaAuthDesc": "仅 Hysteria 客户端使用的凭据。Trojan 和 Shadowsocks 请改用上方的“密码”字段。",
       "uuid": "UUID",
       "flow": "Flow",
       "vmessSecurity": "VMess 加密",