docs(docs): add initial Fumadocs-based documentation site

docs/wrangler.jsonc

@@ -0,0 +1,28 @@
+{
+  "$schema": "node_modules/wrangler/config-schema.json",
+  "name": "leetcode-docs",
+  "main": "./dist/server/index.js",
+  "compatibility_date": "2026-08-13",
+  "compatibility_flags": ["nodejs_als"],
+  "workers_dev": false,
+  "preview_urls": true,
+  "build": {
+    // waku's cloudflare build enhancer writes a .wrangler/deploy redirect to its minimal
+    // generated config (no routes/preview_urls); remove it so this file stays authoritative.
+    "command": "bun run build && rm -rf .wrangler/deploy",
+    "watch_dir": "content"
+  },
+  "routes": [
+    {
+      "pattern": "lc.prad.codes",
+      "custom_domain": true
+    }
+  ],
+  "assets": {
+    "binding": "ASSETS",
+    "directory": "./dist/public",
+    "html_handling": "drop-trailing-slash"
+  },
+  "rules": [{ "type": "ESModule", "globs": ["**/*.js", "**/*.mjs"] }],
+  "no_bundle": true
+}