docs!: single external timestamp (delivery, OpticOdds-parity) — OpenAPI 3.0.0 (SHA-1048)

[Mlaz-code]

BREAKING — OpenAPI 3.0.0

The Odds response exposes a single timestamp field; odds_changed_at, last_seen_at, and wire_received_at are removed. timestamp is the delivery / last-refreshed stamp (advances every ingest cycle — feed-freshness, matching OpticOdds' timestamp), not a price-last-changed time. SharpAPI no longer exposes a "when the price moved" field. Mirrors sharp-api-go #751 (deploy together).

Changes

• public/openapi.json: Odds schema → single timestamp (delivery description); removed the 3 fields; info.version 2.3.0 → 3.0.0 + CHANGELOG entry. FutureOdds/Splits timestamp/ts untouched.
• mdx × 4 langs (en/es/pt-BR/de): field tables collapsed to one timestamp row; example bodies updated; concept page pinnacle-odds-changed-at repurposed to explain timestamp (slug kept so cross-links don't 404; anchor text + _meta.js label updated); migration <Callout> on odds.mdx. Also removed the phantom all_books[].timestamp (the API's per-book all_books[] entries carry no timestamp).
• Remaining odds_changed_at/last_seen_at/wire_received_at mentions are intentional — migration callouts + the concept-page explanation only.

Notes

• Pre-existing all_books[] doc gaps (phantom line, missing sportsbook) are out of scope — separate accuracy pass.

Refs SHA-1048
Type: docs

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