feat(config): wire serial tool into runtime and dashboard

web/frontend/src/i18n/locales/en.json

@@ -593,6 +593,7 @@
         },
         "reasons": {
           "requires_linux": "This tool only works on Linux hosts with the required device files exposed.",
+          "requires_serial_platform": "This tool currently supports Linux, macOS, and Windows hosts with accessible serial ports.",
           "requires_skills": "Enable `tools.skills` before this skill-registry tool can be used.",
           "requires_subagent": "Enable `tools.subagent` before the spawn tool can delegate work.",
           "requires_mcp_discovery": "Enable `tools.mcp.discovery` before MCP discovery tools become available.",

web/frontend/src/i18n/locales/zh.json

@@ -593,6 +593,7 @@
         },
         "reasons": {
           "requires_linux": "该工具仅在 Linux 主机上可用，并且需要暴露对应的设备文件。",
+          "requires_serial_platform": "该工具当前支持 Linux、macOS 和 Windows，且要求主机可访问对应串口。",
           "requires_skills": "需要先启用 `tools.skills`，该技能注册表工具才能使用。",
           "requires_subagent": "需要先启用 `tools.subagent`，`spawn` 才能委派任务。",
           "requires_mcp_discovery": "需要先启用 `tools.mcp.discovery`，MCP 发现工具才会可用。",