chore: integrate treefmt

flake.lock

@@ -54,7 +54,9 @@
       "inputs": {
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
-        "nixpkgs-unstable": "nixpkgs-unstable"
+        "nixpkgs-unstable": "nixpkgs-unstable",
+        "systems": "systems_2",
+        "treefmt-nix": "treefmt-nix"
       }
     },
     "systems": {
@@ -71,6 +73,40 @@
         "repo": "default",
         "type": "github"
       }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1747912973,
+        "narHash": "sha256-XgxghfND8TDypxsMTPU2GQdtBEsHTEc3qWE6RVEk8O0=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "020cb423808365fa3f10ff4cb8c0a25df35065a3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
     }
   },
   "root": "root",