Migrate from Nix flake to devenv and add formatting hooks

Replace Nix flake-based dev environment with devenv for simpler setup.
Add git hooks for automatic code formatting:
- nixfmt-rfc-style for Nix files
- shfmt for shell scripts
- biome for JS/TS/CSS files
- prettier for markdown/yaml/json files

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: macalinao

.envrc

@@ -1 +1,7 @@
-use flake
+export DIRENV_WARN_TIMEOUT=20s
+
+eval "$(devenv direnvrc)"
+
+# The use_devenv function supports passing flags to the devenv command
+# For example: use devenv --impure --option services.postgres.enable:bool true
+use devenv

.gitignore

@@ -1,5 +1,8 @@
+.devenv/
+.claude/settings.local.json
 .direnv/
 .pre-commit-config.yaml
 /result
 
 node_modules/
+.devenv.flake.nix

devenv.lock

@@ -0,0 +1,103 @@
+{
+  "nodes": {
+    "devenv": {
+      "locked": {
+        "dir": "src/modules",
+        "lastModified": 1749243968,
+        "owner": "cachix",
+        "repo": "devenv",
+        "rev": "f46d6d8f67a44a2a9be862a78a179cfe1bd317fb",
+        "type": "github"
+      },
+      "original": {
+        "dir": "src/modules",
+        "owner": "cachix",
+        "repo": "devenv",
+        "type": "github"
+      }
+    },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1747046372,
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "9100a0f413b0c601e0533d1d94ffd501ce2e7885",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "git-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1747372754,
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "80479b6ec16fefd9c1db3ea13aeb038c60530f46",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "git-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1746807397,
+        "owner": "cachix",
+        "repo": "devenv-nixpkgs",
+        "rev": "c5208b594838ea8e6cca5997fbf784b7cca1ca90",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "ref": "rolling",
+        "repo": "devenv-nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devenv": "devenv",
+        "git-hooks": "git-hooks",
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": [
+          "git-hooks"
+        ]
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

devenv.nix

@@ -0,0 +1,60 @@
+{
+  pkgs,
+  lib,
+  config,
+  inputs,
+  ...
+}:
+
+{
+  # https://devenv.sh/packages/
+  packages = with pkgs; [
+    git
+    coreutils-full
+    nixfmt-rfc-style
+    shfmt
+    biome
+  ];
+
+  # https://devenv.sh/languages/
+  languages.javascript = {
+    enable = true;
+    package = pkgs.nodejs_22;
+    bun.enable = true;
+    pnpm = {
+      enable = true;
+      package = pkgs.pnpm.override {
+        nodejs = pkgs.nodejs_22;
+      };
+    };
+  };
+
+  # https://devenv.sh/git-hooks/
+  git-hooks.hooks = {
+    # Format Nix files
+    nixfmt-rfc-style = {
+      enable = true;
+      entry = "${pkgs.nixfmt-rfc-style}/bin/nixfmt";
+      files = "\.nix$";
+    };
+    # Format shell scripts
+    shfmt = {
+      enable = true;
+      entry = "${pkgs.shfmt}/bin/shfmt -w";
+      files = "\.(sh|bash|zsh)$";
+    };
+    # Format JavaScript/TypeScript/JSON/CSS files with Biome
+    biome = {
+      enable = true;
+      entry = "${pkgs.biome}/bin/biome format --write";
+      files = "\.(js|jsx|ts|tsx|css|graphql)$";
+      excludes = [ "config/.*\\.json$" ];
+    };
+    # Run prettier on other files that Biome doesn't support
+    prettier = {
+      enable = true;
+      entry = "${pkgs.nodePackages.prettier}/bin/prettier --write --ignore-unknown";
+      files = "\.(md|html|yml|yaml|json|jsonc)$";
+    };
+  };
+}

devenv.yaml

@@ -0,0 +1,14 @@
+# yaml-language-server: $schema=https://devenv.sh/devenv.schema.json
+inputs:
+  nixpkgs:
+    url: github:cachix/devenv-nixpkgs/rolling
+# If you're using non-OSS software, you can set allowUnfree to true.
+# allowUnfree: true
+
+# If you're willing to use a package that's vulnerable
+# permittedInsecurePackages:
+#  - "openssl-1.1.1w"
+
+# If you have more than one devenv you can merge them
+#imports:
+# - ./backend