feat(drive): add quick mode to status diff

[fangshuyu-768]

Summary

Add a follow-up quick mode to drive +status on top of the modified-time smart sync PR. This keeps the default exact SHA-256 diff intact while adding a best-effort metadata-only path that avoids downloading remote bytes for files present on both sides.

Changes

• add the --quick flag to drive +status and return detection=exact|quick in the output envelope
• compare local mtime against Drive modified_time in quick mode, while keeping exact SHA-256 hashing as the default path
• update shortcut docs and skill guidance to explain the best-effort semantics and performance trade-off
• add unit coverage plus dry-run and live E2E coverage for the new quick mode
• note the only outward-compatible surface change: successful drive +status output now includes data.detection (exact or quick), so strict JSON schema consumers should tolerate the extra field

Test Plan

• Unit tests pass
• Manual local verification confirms the command works as expected
• go test ./shortcuts/drive -run TestDriveStatus
• go test ./tests/cli_e2e/drive -run TestDrive_StatusDryRun|TestDrive_StatusWorkflow
• make unit-test
• go vet ./...
• gofmt -l .
• go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.1.6 run --new-from-rev=origin/main

Related Issues

• Follow-up to feat(drive): add modified-time smart sync mode #859

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