Introduce admin app (#721)

Just a start. Allows reading/writing to EEPROM for now.

This will eventually become an app for prod/quality
control/troubleshooting/...

Author: sonnyp

.zed/settings.json

@@ -0,0 +1,7 @@
+// Folder-specific settings
+//
+// For a full list of overridable settings, and general information on folder-specific settings,
+// see the documentation: https://zed.dev/docs/configuring-zed#settings-files
+{
+  "tab_size": 2
+}

admin/.gitignore

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+.parcel-cache/
+dist/
+node_modules/

admin/eslint.config.js

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+import js from "@eslint/js"
+import globals from "globals"
+import { defineConfig, globalIgnores } from "eslint/config"
+import react from "eslint-plugin-react"
+
+export default defineConfig([
+  {
+    files: ["**/*.{js,mjs,cjs}"],
+    plugins: { js, react },
+    extends: ["js/recommended"],
+    languageOptions: {
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+      globals: { ...globals.browser },
+    },
+    rules: {
+      "react/jsx-uses-vars": "error",
+      "react/jsx-uses-react": "error",
+    },
+  },
+  globalIgnores(["dist"]),
+])

admin/justfile

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+setup:
+    npm install --omit=dev
+    rm -rf .pacel-cache dist
+    npx parcel build --public-url=/admin/fairscope
+    sudo rm -rf /srv/admin
+    sudo cp -r dist /srv/admin
+
+setup-dev:
+    npm install --include=dev
+
+format:
+    npx eslint --fix .
+
+test:
+    npx eslint .
+    node --test
+
+dev:
+    sudo firewall-cmd --zone=public --add-port=1234/tcp &> /dev/null
+    rm -rf .pacel-cache dist
+    npx parcel
+    sudo firewall-cmd --zone=public --remove-port=1234/tcp &> /dev/null