docs: record decisions ADR 0018-0021 (Next.js, sign-in methods, WeOwn Cloud, no-diff rule) and align PRD, guide and AGENTS.md

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014SdXCbrN5PtGExkpvMaMHx
2026-10-12 14:35:01 +00:00
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 # 11. Fastify is the API server; React + Vite is the web shell

- **Status:** Accepted
+- **Status:** Partially superseded by [ADR 0018](0018-nextjs-web-app.md) (the React + Vite web shell). Fastify for `api/` stands.
 - **Date:** 2026-08-15

 ## Context