docs: sync project progress across CLAUDE.md and dev-spec.md
- CLAUDE.md: update project structure (14 tables, admin services, tests,
content dir, audit-log middleware, subscription-service)
- CLAUDE.md: update tech stack (Zod validated routes, Vitest tests)
- CLAUDE.md: add test command to dev commands
- CLAUDE.md: update database section (7 → 14 tables with categories)
- CLAUDE.md: add implementation-plan.md to docs table
- CLAUDE.md: update progress (1a/1b/1c done, 1c-5 remaining)
- dev-spec.md: update status from "待启动开发" to actual progress