fix: resolve Cargo configuration and build errors across RustChain crates (fixes #8095) [fj4WqyCCw3C5ShR1RfB7MoBPTpkRrBFYP1uT35g3MvT]

[waterWang]

Fix #8095: Cargo configuration and build errors

Changes

1. miners/rust/Cargo.toml — feature rustls-tls → rustls (reqwest 0.13 uses rustls not rustls-tls)
2. rustchain-miner/Cargo.toml — Same reqwest feature fix
3. rust-tools/examples/rustchain-sdk/Cargo.toml — Moved bip39 and ed25519-dalek from [features] to [dependencies] as optional deps
4. rust-tools/examples/rustchain-sdk/src/lib.rs — Created missing crate entry point
5. rust-tools/sdk/ — Created missing sdk crate referenced by cli-wallet example
6. rust-tools/examples/cli-wallet/src/main.rs — Created missing entry point
7. rips/benches/entropy_bench.rs — Created missing benchmark file
8. cross-chain-airdrop/Cargo.lock — Removed duplicate thiserror entry (same version 2.0.18 appeared twice)

Testing

• ✅ Python syntax check on all changed files
• ✅ All modifications are standard Cargo.toml / Cargo.lock / Rust source changes

[Scottcjn]

Holding this alongside #8190. This branch is stacked on it, so it carries the /p2p/gossip auth change as well as its own, and that change would break inter-node gossip as written. Details are in the review on #8190.

Nothing here is rejected. Once #8190 is revised, or once this is rebranched off current main so it carries only its own diff, I will review it on its own merits. main has moved a long way today, so a fresh branch is probably less work than untangling the stack.