- Add source_host/source_port parameters for flexible block polling configuration
- Add import_host/import_port parameters to separate import target from source
- Bypass rate limiting for localhost traffic (127.0.0.1, ::1) in middleware
- Increase rate limit from 200 to 5000 requests per 60s for RPC throughput
- Add receiver ready event to prevent dropping initial block broadcasts
- Add special handling for 429 rate
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