Drop deprecated source from tweet.fields

[mintlify]

Forum report (devcommunity.x.com/t/276572, App 1259159 on GET /2/users/:id/tweets): the OpenAPI spec still advertises tweet.fields=source even though source was intentionally removed from X API v2 and the web client. This is what Postman / field-selector UIs pick up.

Changes:

• openapi.json — removed "source" from every tweet.fields enum (10 endpoint occurrences + the PostFieldsParameter reusable) and dropped the deprecated source property from the Post schema.
• x-api/posts/lookup/integrate.mdx — removed the source row from the tweet.fields reference table.

FollowActivityResponsePayload.source (the actor of a follow event) is unrelated and kept.

Validated with mint validate (no new errors) and mint broken-links (clean).

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Generated by Mintlify Agent.

Requested by: tcaldwell@x.ai via Slack
Mintlify session: slack_1790185474.467879_C09MQDT6BM4

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