Good-looking, simple and practical balance monitor

Key features

• In-session queryds_balance tool: the agent can fetch the official balance snapshot anytime (force: true bypasses the cache)
• Zero-config keyReuses DEEPSEEK_API_KEY from dsh's credential service (never written to disk, never logged)
• Multi-currencyCNY/USD both listed (CNY first, $/€/£ rendered per currency)
• amounts stay strings end-to-end, no float math
• Rate-limit friendly30s TTL cache + request serialization (at most one in-flight request) + 5s timeout