feat(eslint): add eslint flat config

prettier.config.js

@@ -0,0 +1,57 @@
+/**
+ * @type {import('prettier').Config}
+ */
+export default {
+  // Basic formatting
+  printWidth: 100,
+  tabWidth: 2,
+  useTabs: false,
+  semi: false,
+  singleQuote: true,
+  quoteProps: "as-needed",
+  trailingComma: "es5",
+  bracketSpacing: true,
+  bracketSameLine: false,
+  arrowParens: "avoid",
+
+  // Language-specific formatting
+  overrides: [
+    {
+      files: "*.astro",
+      options: {
+        parser: "astro",
+      },
+    },
+    {
+      files: ["*.json", "*.jsonc"],
+      options: {
+        trailingComma: "none",
+      },
+    },
+    {
+      files: ["*.md", "*.mdx"],
+      options: {
+        printWidth: 80,
+        proseWrap: "always",
+      },
+    },
+    {
+      files: ["*.yml", "*.yaml"],
+      options: {
+        singleQuote: false,
+      },
+    },
+  ],
+
+  // Plugins
+  plugins: [
+    "prettier-plugin-astro",
+    "prettier-plugin-tailwindcss", // Must be last
+  ],
+
+  // Plugin-specific options
+  tailwindFunctions: ["clsx", "cn", "twMerge"],
+
+  // Astro-specific options
+  astroAllowShorthand: false,
+};