Add Cloudflare Workers configuration

.gitignore

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+# wrangler files
+.wrangler
+.dev.vars*
+!.dev.vars.example
+.env*
+!.env.example

wrangler.jsonc

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+{
+  "$schema": "node_modules/wrangler/config-schema.json",
+  "name": "ga-bv-mathai-cloud",
+  "compatibility_date": "2026-05-29",
+  "observability": {
+    "enabled": true
+  },
+  "assets": {
+    "directory": "."
+  },
+  "compatibility_flags": [
+    "nodejs_compat"
+  ]
+}