[agent] docs: add ima2-generated brand assets and apply to README, docs-site, OG meta

- banner.png, architecture.png, feature-routing.png, banner-alt.png in assets/
- hero.png in docs-site/src/assets/, og.png in docs-site/public/
- README hero replaced with banner + architecture diagram (EN/KO/ZH)
- docs-site splash hero image added to index.mdx
- OG and Twitter card meta tags added to astro.config.mjs

Author: lidge-jun

README.ko.md

@@ -1,22 +1,13 @@
-<div align="center">
-
-<picture>
-  <source media="(prefers-color-scheme: dark)" srcset="assets/logo-dark.png">
-  <img alt="opencodex" src="assets/logo-light.png" width="96" height="96">
-</picture>
-
-# opencodex (`ocx`)
-
-**[OpenAI Codex](https://openai.com/codex)를 위한 범용 프로바이더 proxy — Codex CLI, App, SDK에서 어떤 LLM이든 사용하세요.**
-
-[English](README.md) · **한국어** · [简体中文](README.zh-CN.md)
-
-📖 **[전체 문서 →](https://lidge-jun.github.io/opencodex/ko/)**
+<p align="center">
+  <img src="assets/banner.png" alt="opencodex — 어떤 LLM이든 Codex에서 사용" width="820">
+</p>
 
-</div>
+<p align="center">
+  <a href="README.md">English</a> · <b>한국어</b> · <a href="README.zh-CN.md">简体中文</a> · 📖 <a href="https://lidge-jun.github.io/opencodex/ko/"><b>전체 문서 →</b></a>
+</p>
 
 <p align="center">
-  <img src="assets/dashboard.png" alt="opencodex 대시보드 — 프록시 상태·프로바이더·모델을 보여주는 다크 컨트롤 패널" width="820">
+  <img src="assets/architecture.png" alt="opencodex 아키텍처 — Codex CLI가 opencodex 프록시를 통해 모든 LLM 프로바이더로 라우팅" width="820">
 </p>
 
 Codex는 오직 Responses API(`/v1/responses`)만 사용합니다. opencodex는 Codex와 여러분의 LLM

README.md

@@ -1,22 +1,13 @@
-<div align="center">
-
-<picture>
-  <source media="(prefers-color-scheme: dark)" srcset="assets/logo-dark.png">
-  <img alt="opencodex" src="assets/logo-light.png" width="96" height="96">
-</picture>
-
-# opencodex (`ocx`)
-
-**Universal provider proxy for [OpenAI Codex](https://openai.com/codex) — use any LLM with Codex CLI, App, and SDK.**
-
-[English](README.md) · [한국어](README.ko.md) · [简体中文](README.zh-CN.md)
-
-📖 **[Full documentation →](https://lidge-jun.github.io/opencodex/)**
+<p align="center">
+  <img src="assets/banner.png" alt="opencodex — Universal provider proxy for Codex, use any LLM" width="820">
+</p>
 
-</div>
+<p align="center">
+  <a href="README.md">English</a> · <a href="README.ko.md">한국어</a> · <a href="README.zh-CN.md">简体中文</a> · 📖 <a href="https://lidge-jun.github.io/opencodex/"><b>Full documentation →</b></a>
+</p>
 
 <p align="center">
-  <img src="assets/dashboard.png" alt="opencodex dashboard — a dark provider control panel showing live proxy status, routed providers, and available models" width="820">
+  <img src="assets/architecture.png" alt="opencodex architecture — Codex CLI routes through opencodex proxy to any LLM provider" width="820">
 </p>
 
 Codex only speaks the Responses API (`/v1/responses`). opencodex sits between Codex and your LLM

README.zh-CN.md

@@ -1,22 +1,13 @@
-<div align="center">
-
-<picture>
-  <source media="(prefers-color-scheme: dark)" srcset="assets/logo-dark.png">
-  <img alt="opencodex" src="assets/logo-light.png" width="96" height="96">
-</picture>
-
-# opencodex (`ocx`)
-
-**面向 [OpenAI Codex](https://openai.com/codex) 的通用 provider proxy —— 在 Codex CLI、App 和 SDK 中使用任意 LLM。**
-
-[English](README.md) · [한국어](README.ko.md) · **简体中文**
-
-📖 **[完整文档 →](https://lidge-jun.github.io/opencodex/zh-cn/)**
+<p align="center">
+  <img src="assets/banner.png" alt="opencodex — 使用任意 LLM 的通用代理" width="820">
+</p>
 
-</div>
+<p align="center">
+  <a href="README.md">English</a> · <a href="README.ko.md">한국어</a> · <b>简体中文</b> · 📖 <a href="https://lidge-jun.github.io/opencodex/zh-cn/"><b>完整文档 →</b></a>
+</p>
 
 <p align="center">
-  <img src="assets/dashboard.png" alt="opencodex 控制台 —— 展示代理状态、provider 与可用模型的深色控制面板" width="820">
+  <img src="assets/architecture.png" alt="opencodex 架构 — Codex CLI 通过 opencodex 代理路由到任意 LLM 提供商" width="820">
 </p>
 
 Codex 只能使用 Responses API（`/v1/responses`）。opencodex 位于 Codex 与你的 LLM

assets/architecture.png

@@ -7,6 +7,7 @@ import starlight from "@astrojs/starlight";
 export default defineConfig({
   site: "https://lidge-jun.github.io",
   base: "/opencodex",
+  trailingSlash: "ignore",
   integrations: [
     starlight({
       title: "opencodex",
@@ -19,6 +20,13 @@ export default defineConfig({
         replacesTitle: false,
       },
       favicon: "/favicon.png",
+      head: [
+        { tag: "meta", attrs: { property: "og:image", content: "https://lidge-jun.github.io/opencodex/og.png" } },
+        { tag: "meta", attrs: { property: "og:image:width", content: "1200" } },
+        { tag: "meta", attrs: { property: "og:image:height", content: "630" } },
+        { tag: "meta", attrs: { name: "twitter:card", content: "summary_large_image" } },
+        { tag: "meta", attrs: { name: "twitter:image", content: "https://lidge-jun.github.io/opencodex/og.png" } },
+      ],
       social: [
         { icon: "github", label: "GitHub", href: "https://github.com/lidge-jun/opencodex" },
       ],