feat(cli): destination dates + accommodation free-cancellation flags

[akoso]

Surfaces two API fields the CLI didn't expose yet, and re-syncs the committed OpenAPI snapshot with the live production surface.

Stacked on #1 (the empty-2xx client fix it relies on). Base is fix/cli-from-json-and-login-bugs; retarget to main once #1 merges.

Feature 1 — destination dates

--start-date / --end-date on destinations add and edit. Accepts YYYY-MM-DD (normalized to UTC start-of-day ISO) or a full ISO date-time; maps to body startDate / endDate. Included in edit's "specify at least one of …" guard.

mna destinations edit <trip> <variant> <dest> --start-date 2026-07-07 --end-date 2026-07-15

⚠️ Backend caveat (out of scope here): PATCH destination date persistence depends on the server update handler. The CLI sends the fields correctly (unit-tested); confirm end-to-end with mna trips show <trip> --json.

Feature 2 — accommodation free-cancellation

--free-cancellation-until on options add and edit (accommodation only; clear error otherwise), merged into the body as freeCancellationUntil. For options edit it also makes --from-json optional, so updating just the date needs no JSON file:

mna options edit <trip> <variant> <dest> accommodation <opt> --free-cancellation-until 2026-07-02

OpenAPI sync

Regenerated openapi.json from the live API. The server now declares freeCancellationUntil (+ checkIn/checkOut/times) on the Create/Update accommodation DTOs — closing the contract gap so this flag is fully typed — and returns CreateOptionResultV1Dto { key } on option creation. Structurally additive vs the previous snapshot (74 new leaf paths, 0 removed/changed). schema.ts is gitignored and regenerated from this snapshot by CI.

Tests

normalizeToIsoDateTime and applyFreeCancellation unit-tested; command-level flag→body mapping tests in the client.test.ts style. bun run typecheck, bun run lint, bun test (34 pass), and bun run build all green.

Note: README.md also carries a small pre-existing install-doc note (bun run build before bun link) that was already in the working tree.

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