[Add] nix dev shell

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1778443072,
-        "narHash": "sha256-zi7/fsqM/kFdNuED//4WOCUtezGtKKqRNORjMvfwjnA=",
+        "lastModified": 1778869304,
+        "narHash": "sha256-30sZNZoA1cqF5JNO9fVX+wgiQYjB7HJqqJ4ztCDeBZE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "da5ad661ba4e5ef59ba743f0d112cbc30e474f32",
+        "rev": "d233902339c02a9c334e7e593de68855ad26c4cb",
         "type": "github"
       },
       "original": {
@@ -53,15 +53,35 @@
       "inputs": {
         "flake-parts": "flake-parts",
         "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay",
         "ttp": "ttp"
       }
     },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1778987862,
+        "narHash": "sha256-V3qGt9P1eJP/r/1ONablphfGiH0RP4agQhrRANpDYx8=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "6f44d8874ac29806c8d5cae42bf8e19ebb5ce0d3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
     "ttp": {
       "flake": false,
       "locked": {
         "lastModified": 1778948017,
         "narHash": "sha256-hqBYSZnPq7f/F2Z6nJK+6a8ITk6WRCcVBcNT0CR6SnM=",
-        "ref": "refs/heads/main",
         "rev": "7e5d1953df8592a1feba0f390d205d0ef61a3119",
         "revCount": 117,
         "type": "git",