Setup Cloudflare Workers static assets deployment

Adds wrangler.jsonc for static asset hosting and wrangler as a dev
dependency so the repo is ready to connect via Cloudflare's Workers
Builds Git integration.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

wrangler.jsonc

@@ -0,0 +1,9 @@
+{
+  "$schema": "node_modules/wrangler/config-schema.json",
+  "name": "9router-config-generate",
+  "compatibility_date": "2026-08-15",
+  "assets": {
+    "directory": "./dist",
+    "not_found_handling": "single-page-application"
+  }
+}