First-party visitor counter

This Cloudflare Worker provides the public visit total shown on the homepage. It stores only one aggregate integer in D1 and does not store visitor IP addresses, user agents, or individual profiles.

Deployment requires:

1. A D1 database with schema.sql applied.
2. A Worker with the D1 binding named DB.
3. The custom hostname counter.hushiyu1995.com.
4. A Cloudflare Web Analytics site token added separately for private traffic trends; it is not required for the public count.