JD trade-in subsidy base-effect re-rating loop 2025 subsidy boom pulls demand forward high same-period base electronics-heavy revenue mix first-ever revenue decline JD Retail RMB295.4B vs RMB310.1B prior multiple re-rates to ~8x EPS beat, record margins ignored Q3 2026 branch point growth turns positive report-day ~7%, five sessions ~15% Path A: re-rating up reacceleration + 3.6% yield Path B: value trap ~8x treated as no floor