Mohammadreza Khani 13bf8ba528 feat: implement M2 — multiple upstreams & config ...

- Failover strategy: try resolvers in order until one succeeds
- Env var overrides: DOH_LISTEN, DOH_UPSTREAM_STRATEGY, DOH_UPSTREAM_RESOLVERS
- Graceful shutdown on SIGINT/SIGTERM
- Strategy parsed from config string to enum
- 14 tests passing, clippy clean, fmt clean

2026-07-06 17:13:45 +03:30

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