Add D&D location extractor

internal/modules/dnd/extract/locations/assets/prompts/task.md

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+Extract physical places established by the provided Dungeons & Dragons
+transcript and cite where each place is identified.
+
+Include planes, regions, settlements, districts, buildings, rooms, landmarks,
+routes, and geographic features. A generic label such as "the tavern" is
+allowed only when the transcript uses it for a specific place. Keep aliases and
+nested places when the transcript identifies them; do not merge or invent
+qualifiers for similarly named places.