Implement proxy warmup-aware prefetch scheduling to prevent flooding the network during MTProxy initialization. Add DNS resolver provider failure tracking and extend stale DNS cache to 24 hours for better connectivity resilience.
Key changes:
- Classify and delay story/sticker/media prefetch operations in FileLoader, MediaDataController, and StoriesController
- Track DNS resolver failures per provider to detect outages
- Extend HOST_RESOLVER_STALE_TTL_MS from 1 hour to 24 hours
- Add validation for empty hostnames to prevent malformed DNS queries
- Record DNS cache hits (fresh and stale) for proxy warmup monitoring
- Reorder DNS outage checks before warmup failure callbacks
Also updates the DNS verification tests and proxy rotation guard scripts to validate the new prefetch and DNS failure tracking behavior.
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