feat(bridge): QQ adapter reconnect and send rate limiting

- supervisor loop keeps the OBv11 WebSocket alive, reconnecting with
  exponential backoff (1s→30s) when the connection drops; Start no
  longer fails permanently when NapCat is temporarily unreachable
- Send enforces MinGap between messages (from SendOptions or the
  adapter's send_interval_ms setting, now wired from the admin panel)
- parseMessage no longer panics on events missing sender/time fields
- tests: reconnect after drop, rate limit enforcement, malformed events,
  send while disconnected

backend/cmd/cyrene/main.go

@@ -462,9 +462,12 @@ func loadAdaptersFromConfig(router *bridge.Router, cfg *bridge.BridgeConfig, orc
 		if !ac.Enabled { continue }
 		switch ac.Type {
 		case "qq-obv11":
+			minGapMs := 0
+			fmt.Sscanf(ac.Settings["send_interval_ms"], "%d", &minGapMs)
 			router.Register(bridgeqq.New(bridgeqq.Config{
 				Name: ac.Name, WSURL: ac.Settings["ws_url"],
 				AccessToken: ac.Settings["access_token"], BotQQ: ac.Settings["bot_qq"],
+				MinGapMs: minGapMs,
 			}))
 		case "telegram":
 			router.Register(bridgetg.New(bridgetg.Config{Name: ac.Name, Token: ac.Settings["token"]}))