feat: cream terminal redesign, English-only UI, autopilot launch fixes

- Redesign dashboard into a cream-paper + vermilion IBM Plex Mono terminal
  (live L2 order book, cost/liq map, WS K-line, signal matrix, orchestration
  topology, risk radar, execution log, current positions, equity curve)
- Convert all user-facing UI and backend strings/prompts from Chinese to
  English (multi-language retained, default English)
- Add /api/statistics/full endpoint + full-stats frontend wiring
- Fix Autopilot launch: reuse the existing trader instead of creating
  duplicates (eliminates repeat ~35s create cost and stale-trader 404s);
  launch sends 5m scan interval
- Fix unreadable toasts: cream theme with high-contrast text + per-type accent
- Silence background dashboard polls (getTraderConfig) to stop error-toast spam

trader/auto_trader_force_test.go

@@ -0,0 +1,57 @@
+package trader
+
+import (
+	"testing"
+
+	"nofx/kernel"
+	"nofx/store"
+)
+
+func baseForceTrader() *AutoTrader {
+	cfg := store.GetDefaultStrategyConfig("en")
+	cfg.CoinSource.SourceType = "vergex_signal"
+	cfg.RiskControl.MaxPositions = 5
+	cfg.RiskControl.AltcoinMaxLeverage = 10
+	cfg.RiskControl.AltcoinMaxPositionValueRatio = 10
+	at := &AutoTrader{config: AutoTraderConfig{StrategyConfig: &cfg}}
+	at.strategyEngine = kernel.NewStrategyEngine(&cfg) // empty ranking cache
+	return at
+}
+
+func TestEnsureLongShortCoverageSafeModeSkips(t *testing.T) {
+	at := baseForceTrader()
+	at.safeMode = true
+	out := at.ensureLongShortCoverage(nil, &kernel.Context{}, 100)
+	if len(out) != 0 {
+		t.Fatalf("safe mode must not force opens, got %d", len(out))
+	}
+}
+
+func TestEnsureLongShortCoverageNonVergexSkips(t *testing.T) {
+	at := baseForceTrader()
+	at.config.StrategyConfig.CoinSource.SourceType = "static"
+	out := at.ensureLongShortCoverage(nil, &kernel.Context{}, 100)
+	if len(out) != 0 {
+		t.Fatalf("non-vergex source must not force opens, got %d", len(out))
+	}
+}
+
+func TestEnsureLongShortCoverageBothPresentNoop(t *testing.T) {
+	at := baseForceTrader()
+	in := []kernel.Decision{
+		{Action: "open_long", Symbol: "xyz:AAPL"},
+		{Action: "open_short", Symbol: "BTC"},
+	}
+	out := at.ensureLongShortCoverage(in, &kernel.Context{}, 100)
+	if len(out) != 2 {
+		t.Fatalf("both directions already present -> no force, got %d", len(out))
+	}
+}
+
+func TestEnsureLongShortCoverageNoCandidatesNoForce(t *testing.T) {
+	at := baseForceTrader() // empty ranking cache -> no directional candidates
+	out := at.ensureLongShortCoverage(nil, &kernel.Context{}, 100)
+	if len(out) != 0 {
+		t.Fatalf("no candidates available -> nothing to force, got %d", len(out))
+	}
+}