feat(gateway): complete openclaw phase1 queue parity v2

config/default.yaml

@@ -62,11 +62,13 @@ server:
     violation_window_ms: 10000
   # Per-session FIFO lane queue for gateway requests.
   queue:
-    mode: collect      # collect | steer | interrupt
+    mode: collect      # collect | followup | steer | steer_backlog | interrupt
     cap: 50            # max queued (pending) requests per session lane
     overflow: drop_old # drop_old | drop_new
+    debounce_ms: 0     # delay before starting next queued request
+    summarize_overflow: true
     overrides:
-      channels: {}     # e.g. ws: { mode: steer, cap: 10 }
+      channels: {}     # e.g. ws: { mode: followup, cap: 10, debounce_ms: 100 }
       sessions: {}     # e.g. ws:vip-user: { mode: interrupt, overflow: drop_new }
   # Local-network service discovery (mDNS/Bonjour). Keep disabled by default.
   # Requires server.localhost: false so LAN clients can actually connect.