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The model picker uses a pending-request pattern: the frontend POSTs to create a request, the daemon pops it on its next heartbeat, runs agent.ListModels locally, and reports back. Until now the store was a plain in-memory map per Handler instance. That works for self-hosted single-instance deploys but fails in any multi-replica environment (Multica Cloud). Each replica has its own map, so: POST /runtimes/:id/models → request stored in replica A GET /runtimes/:id/models/<requestId> → polls land on B/C → 404 daemon heartbeat → only A sees PendingModelList POST .../<requestId>/result → daemon's report has to land on A Success probability ~1/N². The visible symptom is "No models available" in the picker for every provider, even those (Claude/Codex) whose catalog is statically populated end-to-end. Same shape of bug, same Redis-backed fix as multica-ai/multica#1557 did for LocalSkillListStore / LocalSkillImportStore. Reuse the operational playbook (namespaced keys, ZSET-backed pending queue, atomic ZREM+SET-running via the shared Lua script) so we don't introduce a second concurrency model for the same primitive. Changes: - Convert ModelListStore from struct to interface with context-aware methods. Add HasPending for cheap heartbeat-side probing. - InMemoryModelListStore — single-node fallback, used when REDIS_URL is unset (self-hosted dev / tests). - RedisModelListStore — multi-node implementation using the same key layout and Lua atomic claim as RedisLocalSkillListStore. - Use RunStartedAt (not UpdatedAt) as the running-timeout reference point, matching the local-skill stores so subsequent UpdatedAt bumps don't reset the running clock. - Heartbeat now uses the probe-then-pop pattern for the model queue (matching local-skills) so a slow Redis can't stall every connected daemon. Extends heartbeatMetrics + slow-log with probe_model_ms / pop_model_ms / probe_model_timed_out for parity. - Wire the Redis backend in NewRouterWithOptions when rdb != nil. - Tests for both backends. Redis tests gate on REDIS_TEST_URL so laptop runs without Redis still pass; CI provides it. Co-authored-by: multica-agent <github@multica.ai>