docs: describe the command palette and keyboard shortcut

[2160039878-cyber]

Description

The shipped command palette is missing from both feature lists. Add matching entries in README.md and docs/FEATURES.md, naming Cmd/Ctrl+K and the tables, connections, saved queries, and actions it exposes.

Type of Change

• Documentation update

Related Issue

Closes #681

Changes Made

• Add one entry to README.md's Professional SQL IDE list.
• Add the same entry to the matching features-document section, following its existing formatting.

Testing

Compared both additions with CommandPalette.tsx: its key handler uses (e.metaKey || e.ctrlKey) && e.key === "k", and the listed command groups exist. Reviewed the two-line diff. No executable code changes or new tests.

Full Linux validation used the repository's unchanged CI workflow on submitted commit 58d0a24781f191c9eb53db3dcce1d5c9caa18df8: run and logs.

• bun run test:coverage: 14,713 tests passed, all 391 core test files and 34 component isolation groups passed.
• bun run coverage:check: 46,324 / 46,324 lines (100%).
• Format, lint, typecheck, knip, README/chart/channel/security drift guards, application/library builds, package type-resolution checks, Helm lint, and Go launcher checks passed.
• Browser E2E 65 passed, subpath E2E 1 passed, PostgreSQL functional smoke 1 passed, packaged tarball/npx E2E 3 passed each, Node 24/26 engine smoke passed.
• Secret Scan, Dependency Scan, and Image Scan passed. The manual secret scan fetched and scanned all fork history and branches, including this commit.

The fork run's overall status is red solely because SonarCloud Analysis lacks the upstream token/project access. All test/build jobs passed. CLAUDE.md explicitly excludes SonarCloud from required checks, and the upstream workflow skips it for fork PRs. Upstream required workflows still need normal maintainer approval.

Full validation ran on GitHub-hosted Linux: this Windows host cannot run the container-based checks because Docker Desktop fails at inference-manager initialization, and its native full component runner encounters SQLite cleanup EBUSY. No complete native-Windows pass is claimed.

Checklist

• Issue acceptance criteria checked; actual validation results recorded above.
• Full tests and the 100% line-coverage gate passed on the submitted commit.
• Diff reviewed; no database-provider changes requiring the provider triad.

Additional Notes

AI-assisted implementation, review, and validation. This branch starts independently from main and contains only this issue's change.

CI follow-up

The fork-run SonarCloud 401 is tracked in #732 and fixed by #733. The inherited condition admitted fork-owned pushes and fork-local PRs to the canonical SonarCloud project. The dedicated CI fix run now succeeds: all nine executable test/build jobs pass, and SonarCloud is scoped to the canonical repository. That run tests CI fix commit 80a318b; this PR's exact-head verification remains the original run linked above, whose nine executable jobs passed. Upstream Actions still await maintainer approval.