Analyse a dating-app screenshot and merge it into the profile

Costs a vision model call. Reads the screenshot with a vision model and extracts structured fields: network, nickname, age, distance, whether she lives there or is passing through, the two languages (app UI vs what she wrote), what she is looking for, kids, her verbatim bio, interests and concrete hooks from her photos. A newer screenshot is MERGED into the stored profile: an empty or unknown value never overwrites a known one, and when a chat screenshot contradicts the profile on location, residency, age or what she is looking for, the chat wins and the contradiction is returned in discrepancies. originNetwork is only set the first time. The first time a network is known, a network history period is opened. A contact whose relationship is not in the dating family is switched to dating. Returns screenshotKind, which decides whether the next message has a character limit.