chore: separate frontend from backend

flake.lock

@@ -68,11 +68,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1761922975,
-        "narHash": "sha256-j4EB5ku/gDm7h7W7A+k70RYj5nUiW/l9wQtXMJUD2hg=",
+        "lastModified": 1763136231,
+        "narHash": "sha256-QVtIjPSQ/xVhuXSSENYOYZPfrjjc/W/djuxcJyKxGTw=",
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "c9f0b47815a4895fadac87812de8a4de27e0ace1",
+        "rev": "4b8c2bbdb4e01ef8c4093ee1224fe21ed5ea1a5e",
         "type": "github"
       },
       "original": {
@@ -140,6 +140,24 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "flakeCompat": {
       "flake": false,
       "locked": {
@@ -264,9 +282,8 @@
       "inputs": {
         "alejandra": "alejandra",
         "devenv": "devenv",
-        "nixpkgs": "nixpkgs",
-        "rust-overlay": "rust-overlay",
-        "systems": "systems"
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
       }
     },
     "rust-analyzer-src": {
@@ -286,26 +303,6 @@
         "type": "github"
       }
     },
-    "rust-overlay": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1762223900,
-        "narHash": "sha256-caxpESVH71mdrdihYvQZ9rTZPZqW0GyEG9un7MgpyRM=",
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "rev": "cfe1598d69a42a5edb204770e71b8df77efef2c3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "oxalica",
-        "repo": "rust-overlay",
-        "type": "github"
-      }
-    },
     "systems": {
       "locked": {
         "lastModified": 1681028828,