feat: release Graft 0.7.0

[mayneyao]

Summary

• add the HTTP v1 remote server packages and strict protocol negotiation
• make ordinary physical SQLite files the default worktree data plane
• route repository control commands through the service layer instead of production PRAGMAs
• preserve page-level incremental storage when staging WAL or rollback-journal databases
• materialize checkout, switch, merge, pull, and clone results safely under SQLite replacement guards
• align English and Chinese docs and prepare all release metadata for 0.7.0

Compatibility

This intentionally removes compatibility for the existing repository PRAGMA/CLI transport. Legacy repository PRAGMAs remain test-only; the optional Graft VFS remains available as a data-plane integration.

Verification

• just test: 566 passed, 1 skipped; 81 doc tests; 5 SQL tests
• cargo fmt --all -- --check
• cargo check --workspace --all-targets --locked
• CI-equivalent cargo clippy command
• pnpm check:remote && pnpm test:remote
• docs pnpm build: 75 pages
• independent pre-landing review with all findings fixed