feat!: probes connect to the backend directly

A probe now links to the backend like an agent (probe.json carries the
server address). The backend sends the agent list as desired state and the
probe reports its platform and build in its own hello. The agent no longer
relays the list or the probe platform. Existing probes must be re-created.

web/admin/src/pages/Probes.tsx

@@ -30,7 +30,7 @@ function IdentityDialog({ identity, title, onClose }: { identity: ProbeIdentityD
           </button>
           <CopyButton text={json} label="复制内容" />
         </div>
-        <Field label="在家宽机器上" hint="保存为 /etc/monitor/probe.json，然后启动 Probe；它会根据 bootstrap 列表连接 Agent，之后的 Agent 列表由面板同步。">
+        <Field label="在家宽机器上" hint="保存为 /etc/monitor/probe.json，然后启动 Probe；它会连接 probe.json 里的面板地址，Agent 列表和更新都由面板下发。">
           <pre className="code">{`monitor-probe --config /etc/monitor/probe.json`}</pre>
         </Field>
         <details>
@@ -126,7 +126,14 @@ export function Probes() {
             <div className="row wrap">
               <span style={{ fontSize: 18, fontWeight: 700 }}>{p.name}</span>
               <NodeTag info={infos.get(p.id)} />
-              {p.revoked ? <Chip tone="bad">已吊销</Chip> : <Chip tone={p.connections.length > 0 ? 'ok' : ''}>{p.connections.length > 0 ? `连着 ${p.connections.length} 个 Agent` : '没有连接'}</Chip>}
+              {p.revoked ? (
+                <Chip tone="bad">已吊销</Chip>
+              ) : (
+                <>
+                  <Chip tone={p.online ? 'ok' : ''}>{p.online ? '已连面板' : '未连面板'}</Chip>
+                  <Chip tone={p.connections.length > 0 ? 'ok' : ''}>{p.connections.length > 0 ? `连着 ${p.connections.length} 个 Agent` : '没有连接'}</Chip>
+                </>
+              )}
               <span className="mono faint">{p.id}</span>
               <span className="right row wrap">
                 <button type="button" className="btn small" onClick={() => setRenaming(p)}>