[dashboard] Add canary deployment artifact ingestion and live/canary mode

[FlowmemoryAI]

Context

The dashboard currently consumes generated fixtures. The Base V0 canary deployment has real deployed addresses and smoke FlowPulse logs, but no dashboard ingestion path.

Build

Add a dashboard-consumable deployment artifact and canary data mode that:

• reads deployment addresses and block ranges;
• reads indexed canary output from the guarded reader;
• keeps generated fixture mode available;
• clearly labels canary data and avoids production/mainnet-readiness claims;
• adds tests for missing deployments and partial read data.