web: unify Agent management and add a draggable link board

Replace Probe pages with directed Agent links, shared deployment controls and unified display data. Add node dragging, canvas pan and zoom, saved layouts, and per-direction link controls.

web/display/src/LineStrips.tsx

@@ -73,7 +73,7 @@ export function LineStrips({ lineId, range, m }: Props) {
           {series.error ? <span className="line-mini-badge bad" title={`上一次取数失败：${series.error.message}`}>数据未更新</span> : null}
         </div>
         <div className="line-mini-direction">
-          <div className="line-mini-direction-head" title={`去程 Probe → Agent 丢包 ${fmtPct(up)}`}>
+          <div className="line-mini-direction-head" title={`去程 拨号方 → 监听方 丢包 ${fmtPct(up)}`}>
             <span>去程</span>
             <span className={`line-mini-badge ${levelOf(up)}`}>{upText}</span>
           </div>
@@ -84,7 +84,7 @@ export function LineStrips({ lineId, range, m }: Props) {
           </div>
         </div>
         <div className="line-mini-direction">
-          <div className="line-mini-direction-head" title={`回程 Agent → Probe 丢包 ${fmtPct(down)}`}>
+          <div className="line-mini-direction-head" title={`回程 监听方 → 拨号方 丢包 ${fmtPct(down)}`}>
             <span>回程</span>
             <span className={`line-mini-badge ${levelOf(down)}`}>{downText}</span>
           </div>