tiennm99
254bf47dc1
feat(gold): add gold paper trading module
Opt-in module for gold paper trading with VND currency.
Commands: /gold_topup, /gold_buy, /gold_sell, /gold_stats.
Pricing: spot XAU USD converted to VND per luong via GoldPrice.org + ExchangeRate-API.
Features: FX caching, dust normalization (1e-9), HTTPS-only URL validation,
per-user key locking, namespace isolation from trading module.
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