Fall back to daily prev_close for margin estimates; keep previous cache when refresh gets all no_price; stop re-fetching only for missing turnover.
Co-authored-by: Cursor <cursoragent@cursor.com>
Move business code under modules/, env template to config/, PM2 single qihuo process, and _legacy shims for old imports.
Co-authored-by: Cursor <cursoragent@cursor.com>