feat: extract actors, directors, screenwriters from Wikipedia API

- Extract directors from infobox 'Directed by' field/list
- Extract screenwriters from infobox 'Screenplay by' list
- Extract actors from Cast section list (first link = person name)
- Upsert into people table, link via who table (profession: actor=1, director=2, screenwriter=3)
- Track processed entries with has_people flag column
- Consumer inserts people and marks has_people=1 on success

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