chore: seal Design Vision v1 and monorepo scaffold

Archive the differentiated YuXinGu product docs, AI engineering system,
design contract, and Go/Vue scaffold. Next execution prioritizes Cece-parity
over early innovation (see .ai/product/STRATEGY.md).

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/README.md

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+# Cursor as Agent Runtime
+
+`.cursor/` is **not** a second source of truth.
+
+Everything under `rules/`, `templates/`, `commands/` is a **symlink** into `.ai/`.
+
+| Cursor path | Points to |
+|---|---|
+| `rules/*.md` | `.ai/*.md` (constitution, architecture, coding, …) |
+| `templates/feature.md` | `.ai/playbooks/add-api.md` |
+| `commands/review.md` | `.ai/review.md` |
+
+Edit only `.ai/`. Never duplicate content here.

.cursor/commands/project-commands.md

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+../../.ai/commands.md

.cursor/commands/refactor.md

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+../../.ai/prompts/refactor.md

.cursor/commands/review.md

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+../../.ai/review.md

.cursor/rules/ai-contract.md

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+../../.ai/ai-contract.md

.cursor/rules/api.md

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+../../.ai/api.md

.cursor/rules/architecture.md

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+../../.ai/architecture.md

.cursor/rules/coding.md

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+../../.ai/coding.md

.cursor/rules/constitution.md

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+../../.ai/constitution.md

.cursor/rules/database.md

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+../../.ai/database.md

.cursor/rules/design-system.md

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+../../.ai/design/design-system.md

.cursor/rules/domain-map.md

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+../../.ai/domain/domain-map.md

.cursor/rules/domain.md

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+../../.ai/domain.md

.cursor/rules/feature-map.md

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+../../.ai/product/feature-map.md

.cursor/rules/forbidden.md

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+../../.ai/forbidden.md

.cursor/rules/review.md

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+../../.ai/review.md

.cursor/templates/feature-checklist.md

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+../../.ai/checklists/feature.md

.cursor/templates/feature.md

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+../../.ai/playbooks/add-api.md