eosrio / rs-abieos / 26075309438

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refactor(rust-backend): split 3156-line rust.rs into focused modules

Pure mechanical move of the single-file Rust backend into a src/backend/rust/
module directory. No behavior change: no symbols renamed, no logic reordered,
no signatures changed, error-message strings byte-identical (parity-tested
against the C++ backend).

Layout (mod.rs owns the FFI boundary):
  mod.rs      type aliases, abieos_context_s, FFI glue, 21 abieos_* extern fns
  json.rs     Json/JsonParser/parse_json/quote_json
  stream.rs   binary Writer/Reader
  hex.rs      hex encode/decode
  name.rs     name conversion
  abi_def.rs  AbiDef + *Def model, ABI bin/json (de)serialization
  abi.rs      TypeKind/Abi resolution + runtime json<->bin codec
  builtins.rs BUILTINS, write/read_builtin, numeric parse helpers
  symbol.rs   symbol/asset/bitset
  time.rs     time parsing
  crypto.rs   KeyKind/write_key_like, base58, ripemd160, sha256

Public surface at crate::backend::rust unchanged (src/backend.rs and
src/lib.rs untouched); 'pub use super::rust::*;' resolves as before. Some
*Def/Abi fields widened to pub(crate) for cross-module access (visibility
only). Verified green: cargo test --no-default-features --features
rust-backend, and rust-backend + cpp-oracle differential parity.

0 of 298 new or added lines in 5 files covered. (0.0%)

243 of 784 relevant lines covered (30.99%)

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