docs: describe the unified Agent topology and link controls

Align architecture, protocol, API, storage, security and deployment documentation with default mutual measurements and the Agent link board.

docs/design/query.md

@@ -103,7 +103,7 @@ id 的格式为 `指标.统计量`，详见 [analysis.md](analysis.md) 第 4 节
 
 ```json
 {
-  "line_id": "agt_…~prb_…", "agent_id": "agt_…", "probe_id": "prb_…", "ip_version": "ipv4",
+  "line_id": "agt_…~agt_…", "agent_id": "agt_…", "dialer_id": "agt_…", "ip_version": "ipv4",
   "from": "2026-09-28T10:00:00.000Z", "to": "2026-09-28T10:15:00.000Z",
   "step": "2s", "source": "hot", "live": true, "degraded": false,
   "t": [1759053600000, 1759053602000, 1759053604000],
@@ -118,7 +118,7 @@ id 的格式为 `指标.统计量`，详见 [analysis.md](analysis.md) 第 4 节
     "coverage": 0.998
   },
   "edge_partial": { "first": false, "last": true },
-  "gaps":   [{ "from": "…", "to": "…", "reason": "probe_disconnected" }],
+  "gaps":   [{ "from": "…", "to": "…", "reason": "dialer_disconnected" }],
   "events": [{ "at": "…", "kind": "endpoint_changed", "detail": "…" }],
   "versions": { "loss.down": "a1f3…" }
 }
@@ -146,7 +146,7 @@ id 的格式为 `指标.统计量`，详见 [analysis.md](analysis.md) 第 4 节
 {
   "range": "15m", "from": "…", "to": "…",
   "lines": [
-    { "id": "agt_…~prb_…", "agent_id": "agt_…", "probe_id": "prb_…", "name": "jp-1", "online": true,
+    { "id": "agt_…~agt_…", "agent_id": "agt_…", "dialer_id": "agt_…", "name": "jp-1", "online": true,
       "summary": { "loss.down": 0.1, "loss.up": 0.0, "rtt.p95": 48.0, "tcp.retrans": 0.1, "score.mc": 94 },
       "coverage": 1.0 }
   ]