feat(backend) update (unfinished)

gateway/.gitignore

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+target/
+
+Cargo.lock

gateway/Cargo.toml

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+[package]
+name = "gateway"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

gateway/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}