Beijing market rates (Sep 2026) for the four IT outsourcing pricing models; what Siwenlide’s four published IT All-in-One tiers (Basic RMB 1,999 / Standard RMB 3,999 / All-in-One RMB 6,999 / Flagship RMB 9,999 per month and up) include and exclude; how the roughly RMB 48,000 annual figure for a 30-person company is calculated; and the hidden items you must ask about before signing.