fix(registry): scope docs registry output under react framework path (1.0)

[junghyeonsu]

Why

The latest @seed-design/cli resolves snippets from {baseUrl}/__registry__/{framework}/... (introduced on dev by #1591 + Lynx work). The 1.0 maintenance deploy (1-0.seed-design.pages.dev) still served the legacy flat layout {baseUrl}/__registry__/{ui,lib,breeze}/..., so @seed-design/cli@latest add-all ... --baseUrl https://1-0.seed-design.pages.dev broke.

Backport of #1591 (react portion only) for DES-1932. Companion to the 1.1 backport (#1657).

What

• Re-path the generated registry output from public/__registry__/{ui,lib,breeze}/... to public/__registry__/react/... (pure move; component JSON content unchanged).
• Add a top-level public/__registry__/index.json advertising the react framework.
• Update docs/scripts/generate-registry.ts to emit the framework-scoped layout (so future bun generate:registry reproduces it).
• Point manual-installation.tsx / breeze-manual-installation.tsx at the new react/ paths.

Excluded (intentionally)

• lynx — this branch has no lynx components; advertising it would make the CLI request a non-existent lynx/ registry (404).
• CLI (packages/cli) — published from main/dev, not from maintenance branches.
• generate-docs-index.ts (absent here), commands.mdx (its GitHub-raw example targets the source docs/registry/ which stays flat on this branch), and the block registry (absent here).

Verification

• react/ json count == previous flat count (41 == 41); pure re-path, no content change.
• Maps exactly to the latest CLI fetch URLs: fetchAvailableRegistries → __registry__/react/index.json, fetchRegistry → __registry__/react/{id}/index.json, item → __registry__/react/{id}/{item}.json.
• After merge: confirm Cloudflare Pages rebuilds and https://1-0.seed-design.pages.dev/__registry__/react/index.json resolves.

🤖 Generated with Claude Code

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