Init with backend

.gitignore

@@ -0,0 +1 @@
+backend/target

backend/Cargo.toml

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+[package]
+name = "backend"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+async-trait = "0.1.89"
+axum = { version = "0.8.6", features = ["json"] }
+serde = "1.0.228"
+serde_json = "1.0.145"
+sqlx = { version = "0.8.6", features = ["postgres", "runtime-tokio"] }
+thiserror = "2.0.17"
+tokio = { version = "1.48.0", features = ["macros", "rt-multi-thread"] }
+tracing = "0.1.41"
+tracing-subscriber = "0.3.20"

backend/src/main.rs

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

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1761114652,
+        "narHash": "sha256-f/QCJM/YhrV/lavyCVz8iU3rlZun6d+dAiC3H+CDle4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "01f116e4df6a15f4ccdffb1bcd41096869fb385c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Blackjack Rust backend";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      forAllSystems =
+        function:
+        nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed (
+          system: function (
+            import nixpkgs {
+              inherit system;
+            }
+          )
+        );
+    in
+    {
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            rustc
+            cargo
+            rust-analyzer
+            rustfmt
+            clippy
+          ];
+
+          RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
+        };
+      });
+    };
+}