feat: choose which probes link to which agents from the admin

The panel decides the probe/agent pairs and probes always dial out. A new
fleet.auto_link setting connects every probe to every agent (default); with it
off only the pairs chosen by hand connect, and any pair can be forced on or
off. The Probes page has a link matrix with the switch and per-pair toggles.

web/display/src/display.css

@@ -1205,19 +1205,11 @@ input {
 }
 
 /* 版本、tag：等宽的小字 */
-.fact .v.mono-tag,
-.probe-tag {
+.fact .v.mono-tag {
   font-family: var(--font-mono);
   font-size: 11px;
 }
 
-.probe-tag {
-  padding: 0 6px;
-  border-radius: 6px;
-  background: color-mix(in srgb, var(--app-ink) 6%, transparent);
-  color: var(--app-ink-muted);
-}
-
 .build-info {
   display: flex;
   flex-wrap: wrap;
@@ -1227,3 +1219,35 @@ input {
   font-family: var(--font-mono);
   font-size: 11px;
 }
+
+/* 总览卡片里的线路标题：名字太长就省略号，右边只放一个短标签，不换行 */
+.line-top {
+  min-width: 0;
+}
+
+.line-top .line-name {
+  flex: 1 1 auto;
+  min-width: 0;
+  white-space: nowrap;
+}
+
+.line-top .line-name .arrow {
+  flex: none;
+}
+
+.line-top .line-name .name {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.line-top .line-name .flag,
+.line-top .line-name .isp {
+  flex: none;
+}
+
+.line-top .line-range,
+.line-top .chip {
+  flex: none;
+  white-space: nowrap;
+}

web/display/src/pages/Overview.tsx

@@ -95,18 +95,13 @@ function Card({ agent, host, range, infos }: { agent: AgentCard; host: HostItem
           return (
             <Link key={l.id} to={`/line/${encodeURIComponent(l.id)}`} className="line-link">
               <div className="line-top">
-                <span className="line-name">
-                  → {infos.get(l.probe_id)?.country ? <Flag code={infos.get(l.probe_id)!.country!} /> : null}
-                  {l.probe_name}
+                <span className="line-name" title={[l.probe_name, infos.get(l.probe_id)?.tag || infos.get(l.probe_id)?.version].filter(Boolean).join(' · ')}>
+                  <span className="arrow">→</span>
+                  {infos.get(l.probe_id)?.country ? <Flag code={infos.get(l.probe_id)!.country!} /> : null}
+                  <span className="name">{l.probe_name}</span>
+                  {infos.get(l.probe_id)?.isp_key ? <IspIcon ispKey={infos.get(l.probe_id)!.isp_key!} name={infos.get(l.probe_id)!.isp_name} /> : null}
                 </span>
-                {infos.get(l.probe_id)?.isp_key ? <IspIcon ispKey={infos.get(l.probe_id)!.isp_key!} name={infos.get(l.probe_id)!.isp_name} /> : null}
-                {infos.get(l.probe_id)?.tag || infos.get(l.probe_id)?.version ? (
-                  <span className="probe-tag" title="Probe 版本">
-                    {infos.get(l.probe_id)?.tag || infos.get(l.probe_id)?.version}
-                  </span>
-                ) : null}
-                <span className="faint">近 {OVERVIEW_RANGES.find((r) => r.value === range)?.label ?? range}</span>
-                {!l.probe_connected && l.online ? <Chip tone="warn">Probe 未连接</Chip> : null}
+                {!l.probe_connected && l.online ? <Chip tone="warn">未连接</Chip> : <span className="faint line-range">{OVERVIEW_RANGES.find((r) => r.value === range)?.label ?? range}</span>}
               </div>
               <LineStrips lineId={l.id} range={range} m={m} />
             </Link>