Add project configuration and build assets

- .gitignore: Ignore node_modules, .env, dist, .wrangler
- .env.example: Environment variable template
- package.json, package-lock.json: Tailwind CSS build setup
- src/input.css: Tailwind source file
- style.css: Production Tailwind build
- og-image.png: Open Graph image for social sharing

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "anvil-hosting",
+  "version": "1.0.0",
+  "description": "공식 웹사이트: https://hosting.anvil.it.com",
+  "main": "index.js",
+  "scripts": {
+    "build:css": "npx @tailwindcss/cli -i ./src/input.css -o ./style.css --minify",
+    "watch:css": "npx @tailwindcss/cli -i ./src/input.css -o ./style.css --watch",
+    "build": "npm run build:css",
+    "dev": "npm run watch:css"
+  },
+  "repository": {
+    "type": "git",
+    "url": "ssh://sc-gitea@ssh.anvil.it.com:2201/kaffa/anvil-hosting.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@tailwindcss/cli": "^4.1.18",
+    "tailwindcss": "^4.1.18"
+  }
+}