extract amounts

Surface every rupee figure in a document with surrounding context. Each result has: raw_text (e.g. "Rs 11.21 lakh crore"), value, unit, value_crore (normalised), has_currency_marker, char_offset, and a context snippet of ``context_chars`` chars on each side. Set ``only_with_currency=True`` to drop figures that were tagged only by their unit (no Rs/₹ prefix).