fix(omniroute): raise stream-idle timeout to 180s

Contended prefill (see LLAMA_PARALLEL) can outrun the ~95s dashboard
value before first token, causing OmniRoute to cancel still-working
requests. Track it in git via STREAM_IDLE_TIMEOUT_MS instead of a
dashboard-only setting.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docker-compose.yml

@@ -92,6 +92,14 @@ services:
       # Docker guide — every client here is a coding CLI, which needs the
       # larger figure the guide recommends. Paired with mem_limit below.
       - OMNIROUTE_MEMORY_MB=8192
+      # Default 300000 (5 min) per OmniRoute's own docs, but this deployment
+      # had it dialed down elsewhere (dashboard) to ~95s — too tight for a
+      # contended local llama-server: large-context prefill under multiple
+      # concurrent slots can outrun that before the first SSE token arrives,
+      # so OmniRoute cancels a request that was actually still working (see
+      # LLAMA_PARALLEL above for the other half of this fix). Raised here so
+      # it's tracked in git instead of a dashboard-only setting.
+      - STREAM_IDLE_TIMEOUT_MS=${OMNIROUTE_STREAM_IDLE_TIMEOUT_MS:-180000}
     # Same reasoning as litellm's extra_hosts entry below — ai-stack's bridge
     # network can't resolve search.home on its own.
     extra_hosts: