Agent 节点免填地址/端口/API令牌（前后端校验）+ 补翻译

internal/web/translation/en-US.json

@@ -1181,9 +1181,9 @@
       "pinFetched": "Fetched the node's current certificate",
       "pinFetchFailed": "Could not fetch the certificate",
       "nodeType": "Node Type",
-      "nodeTypeTraditional": "Traditional Panel",
-      "nodeTypeAgent": "Agent",
-      "agentHint": "Agent nodes don't need a panel address. An agent token will be generated on creation for configuring the agent on the node machine.",
+      "nodeTypeTraditional": "Traditional Panel Node",
+      "nodeTypeAgent": "Agent Lightweight Node",
+      "agentHint": "Agent nodes connect out to the master; no address, port or API token needed. An install command is generated on creation.",
       "agentTokenTitle": "Agent Node Setup",
       "agentTokenCreated": "Node {{name}} created successfully",
       "agentTokenHint": "Copy the command below and run it on the node machine. This token is shown only once!",

internal/web/translation/zh-CN.json

@@ -1063,9 +1063,9 @@
       "pinFetched": "已获取节点当前证书",
       "pinFetchFailed": "无法获取证书",
       "nodeType": "节点类型",
-      "nodeTypeTraditional": "传统面板",
-      "nodeTypeAgent": "Agent",
-      "agentHint": "Agent 节点无需面板地址，创建后会自动生成 agent token，用于在节点机上配置 agent。",
+      "nodeTypeTraditional": "传统面板节点",
+      "nodeTypeAgent": "Agent 轻量节点",
+      "agentHint": "Agent 节点由节点机主动连接主控，无需填写地址、端口和 API 令牌。创建后会生成安装命令。",
       "agentTokenTitle": "Agent 节点安装",
       "agentTokenCreated": "节点 {{name}} 创建成功",
       "agentTokenHint": "复制下面的命令，在节点机上运行即可完成安装。此 token 只显示一次！",