Clarify standalone application architecture

[catherineluse]

Summary

• rename the README heading and overview so the repository is described as the complete AI Beta Reader application rather than a frontend-only package
• remove the stale Express-backend prerequisite, backend repository references, and documented VITE_API_BASE_URL requirement
• clarify that OpenAI is called directly with the user-configured key and that Google Drive setup is optional
• add a Mermaid architecture diagram covering the shared Vue application, browser/Electron/Android targets, platform-specific local storage, direct OpenAI integration, and encrypted Google Drive backup flow

Why

The README still described a historical split architecture even though the active application is local-first and self-contained in this repository. The legacy API service is not imported by the running app, and no Express server is required to run any supported target.

Validation

• reviewed active imports and runtime integrations for database, image storage, OpenAI, and cloud backup
• verified the README diff with git diff --check
• documentation-only change; no application tests required

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Project	Deployment	Actions	Updated (UTC)
ai-beta-reader-frontend	Ready	Preview, Comment	Jul 16, 2026 5:59am