feat: implement manual RPC backup via RocksDB checkpoint (Approach A)#1110

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Zhangcy0x3 wants to merge 3 commits intonervosnetwork:developfrom

Zhangcy0x3:feat/backup-rpc-manual

Commits on Feb 7, 2026

Commits on Feb 8, 2026

fix: resolve WASM compatibility and clippy warnings
Zhangcy0x3
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