OAuth 2.0 授权流程可视化

一张贴纸等距风格信息图，在淡蓝色网格背景上展示 OAuth 2.0 授权码流程。四个等距 3D 积木角色呈松散菱形排列：用户图标、浏览器窗口块、标注 「Auth Server」 的授权服务器塔楼、标注 "API" 的资源服务器块。编号流程箭头依序 1–6 弯曲连接，各标注步骤说明。每个角色块有薰衣草、薄荷、蜜桃、天蓝四种柔和面色。柠檬黄便利贴标注：「OAuth 2.0 授权流程可视化」简洁投影，顶部圆润粗体标题。

A sticker-isometric infographic depicting the OAuth 2.0 authorization code flow on a soft sky-blue grid background. Four isometric 3D building-block actors arranged in a loose diamond: a user icon (person silhouette), a browser window block, an authorization server tower labeled "Auth Server", and a resource server block labeled "API". Numbered flow arrows curve between them in sequence 1–6, each labeled: "1 Request access", "2 Redirect to login", "3 User approves", "4 Auth code issued", "5 Exchange for token", "6 Return protected data". Each actor block has a distinct pastel face: lavender, mint, peach, sky. Callout sticky-note in lemon yellow: "The app never sees your password — only a temporary token." Clean drop shadows, no texture on faces. Title in rounded bold at top.