docs(readme): remove zhihu blog backlink + badge (article was removed) (#85)

The Chinese blog post linked from these two places was taken down by
the 知乎 platform shortly after publication. Both pointers now resolve
to a "content removed" warning page, which is a worse signal to
visitors than no link at all. Removing both before they reach more
README readers.

Reverts the additions from #81 specifically:
- Top badges row: drop the "blog · engineering story" shield
- §Why OCP? closing blockquote: drop the line pointing at the article

The 知乎 article URL is no longer reachable, so retaining the references
would route incoming traffic to a dead page that suggests the project
is itself problematic. Better to leave that section silent until a
working canonical write-up exists somewhere.

Doc-only change. server.mjs not touched. ALIGNMENT.md Rule 5 (cli.js
citation) does not apply.

Co-authored-by: dtzp555 <dtzp555@gmail.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

README.md

@@ -1,6 +1,6 @@
 # OCP — Open Claude Proxy
 
-[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE) [![GitHub release](https://img.shields.io/github/v/release/dtzp555-max/ocp)](https://github.com/dtzp555-max/ocp/releases) [![Read the story](https://img.shields.io/badge/blog-engineering_story-555.svg)](https://zhuanlan.zhihu.com/p/2036388634207770402) [![Buy Me a Coffee](https://img.shields.io/badge/Buy_Me_a_Coffee-ffdd00?logo=buy-me-a-coffee&logoColor=black)](https://buymeacoffee.com/dtzp555)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE) [![GitHub release](https://img.shields.io/github/v/release/dtzp555-max/ocp)](https://github.com/dtzp555-max/ocp/releases) [![Buy Me a Coffee](https://img.shields.io/badge/Buy_Me_a_Coffee-ffdd00?logo=buy-me-a-coffee&logoColor=black)](https://buymeacoffee.com/dtzp555)
 
 > **Already paying for Claude Pro/Max? Use your subscription as an OpenAI-compatible API — $0 extra cost.**
 
@@ -52,8 +52,6 @@ OCP and the alternatives serve adjacent but distinct needs. Pick the one that fi
 
 OCP is single-maintainer + LLM-assisted, currently pre-1.0. It runs the maintainer's daily Claude Code workflow. If something breaks, [open an issue](https://github.com/dtzp555-max/ocp/issues).
 
-> 📖 **Engineering philosophy + the 9-day hallucinated `/api/oauth/usage` drift incident** that made `cli.js` alignment binding: [知乎专栏文章](https://zhuanlan.zhihu.com/p/2036388634207770402)
-
 ## Supported Tools
 
 Any tool that accepts `OPENAI_BASE_URL` works with OCP: