Feat/desktop multi kb picker

[claytonlin1110]

What changed

Adds a Tauri native shell under desktop/app/ with File → Open KB…, File → Recent KBs (last five), and File → New KB…. Switching KBs restarts the vouch review-ui sidecar against the new project root; recent opens persist in ~/.config/vouch-desktop/state.json. Shared Python helpers live in src/vouch/desktop/ with vouch desktop * CLI commands. Review-ui /healthz and templates now expose kb_label; vouch init --json supports structured init output for the shell.

Closes #207

Why

Real users keep a .vouch/ per project; the CLI walks up from cwd to find it, but a desktop app needs an explicit picker so you can switch projects without env-var dance or restarting the app (#207).

What might break

No breaking changes to existing .vouch/ directories or kb.* protocol.

• Additive: /healthz gains kb_label; review-ui masthead/title show the active project name instead of the generic "review console" string.
• Additive: vouch init --json, vouch desktop … subcommands.
• No file moves, on-disk schema changes, or review-gate behaviour changes.

VEP

Not required — new desktop packaging layer and additive CLI/web fields only; no object-model or kb.* surface change.

Tests

• make check passes locally (lint + mypy + pytest)
• New / changed behaviour has a test (tests/test_desktop.py, tests/test_desktop_ports.py, tests/test_desktop_sidecar.py, updated tests/test_web.py)
• CHANGELOG.md updated under ## [Unreleased]

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[claytonlin1110]

@plind-junior Please review

[claytonlin1110]

@plind-junior Please review

[plind-junior]

Vouch is hardly reshaped and all the previous issues and PRs are unnecessary. I will create the issue tickets