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>
This commit is contained in:
jackyu66git
2026-08-02 16:00:44 +08:00
co-authored by Cursor
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# Playbook: Payment / Unlock / Subscription
## Steps
1. Terms: Order, Payment, Unlock, Subscription, Membership, VIP (`.ai/domain.md`)
2. Server creates Order with amount/currency/product ref
3. Client never sets final price unilaterally
4. Payment callback verifies signature + idempotency
5. On success: grant Membership or Unlock in service transaction
6. Report access checks Membership/Unlock server-side every time
7. Migration for `payment_order` / related tables
8. Tests: double callback, wrong amount, replay
9. No secrets in frontend
10. Feature checklist + security review