refactor: migrate from Biome to oxlint/oxfmt, remove contact form

- Replace Biome with oxlint + oxfmt (OXC toolchain) for linting and formatting
- Add .oxlintrc.json and .oxfmtrc.json configuration files
- Update VS Code settings and devcontainer to use oxc-vscode extension
- Remove contact form, Resend email integration, and related server action/schema
- Remove unused UI components (accordion, alert, card, tabs, toggle, etc.)

components.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://ui.shadcn.com/schema.json",
-  "style": "new-york",
+  "style": "base-nova",
   "rsc": true,
   "tsx": true,
   "tailwind": {
@@ -11,6 +11,7 @@
     "prefix": ""
   },
   "iconLibrary": "lucide",
+  "rtl": false,
   "aliases": {
     "components": "@/components",
     "utils": "@/lib/utils",
@@ -18,5 +19,7 @@
     "lib": "@/lib",
     "hooks": "@/hooks"
   },
+  "menuColor": "default",
+  "menuAccent": "subtle",
   "registries": {}
 }