feat(strategy): Add Hyperliquid coin sources (hyper_all, hyper_main) (#1388)

Add two new coin source options for Hyperliquid trading:

- hyper_all: All available Hyperliquid perpetual coins (229 coins)
- hyper_main: Top N coins by 24h volume (default 20)

Changes:
- Add CoinSourceConfig fields: UseHyperAll, UseHyperMain, HyperMainLimit
- Add provider/hyperliquid/coins.go with caching (24h) and volume-based sorting
- Add source types 'hyper_all' and 'hyper_main' to GetCandidateCoins()
- Support mixing with other sources in 'mixed' mode
- Add source tag formatting for UI display

This ensures traders using Hyperliquid can select coins that are actually
available on the exchange, avoiding 'symbol not found' errors.

store/strategy.go

@@ -119,6 +119,12 @@ type CoinSourceConfig struct {
 	UseOILow bool `json:"use_oi_low"`
 	// OI Low maximum count
 	OILowLimit int `json:"oi_low_limit,omitempty"`
+	// whether to use Hyperliquid All coins (all available perp pairs)
+	UseHyperAll bool `json:"use_hyper_all"`
+	// whether to use Hyperliquid Main coins (top N by 24h volume)
+	UseHyperMain bool `json:"use_hyper_main"`
+	// Hyperliquid Main maximum count (default 20)
+	HyperMainLimit int `json:"hyper_main_limit,omitempty"`
 	// Note: API URLs are now built automatically using NofxOSAPIKey from IndicatorConfig
 }