fix: NOFXi Agent real AI integration + quality improvements

Critical fixes:
1. Agent now uses NOFX's MCP client for AI calls (real models, not placeholder)
   - Gets AI client from first configured trader's MCP config
   - Added AutoTrader.GetMCPClient() export
2. /analyze uses REAL market data (market.Get → EMA/MACD/RSI/BB/OI/funding)
   then sends to AI — no more hallucinated prices
3. AI chat enriches prompts with live market data when user mentions a coin
4. Fallback: if AI unavailable, shows raw formatted market data (still useful)

Router improvements:
- Better natural language detection for Chinese
- '该不该买' '走势' '趋势' '行情' → analyze intent
- '多少钱' '赚了' '亏了' → query intent
- Fewer messages falling through to generic chat

Web UI:
- Endpoints updated to /api/agent/* namespace
- nofxi.html served at agent root (localhost:8900)

Result: AI analysis now shows real BTC price, real RSI, real EMA — not fiction.

agent/router.go

@@ -38,11 +38,14 @@ func NewRouter() *Router {
 			regexp.MustCompile(`(?i)(做多|做空|买入|卖出|开仓|平仓)\s*(.+)`),
 		},
 		queryPatterns: []*regexp.Regexp{
-			regexp.MustCompile(`(?i)(position|balance|pnl|profit|loss|持仓|余额|盈亏|trader|交易员)`),
+			regexp.MustCompile(`(?i)(position|balance|pnl|profit|loss|持仓|余额|盈亏|trader|交易员|账户|仓位|资金)`),
+			regexp.MustCompile(`(?i)(多少钱|赚了|亏了|收益|回报)`),
 		},
 		analyzePatterns: []*regexp.Regexp{
-			regexp.MustCompile(`(?i)(analyze|analysis|分析|看看)\s+(.+)`),
-			regexp.MustCompile(`(?i)(what.*think|怎么看|你觉得)\s*(.+)?`),
+			regexp.MustCompile(`(?i)(analyze|analysis|分析|看看|研究)\s+(.+)`),
+			regexp.MustCompile(`(?i)(what.*think|怎么看|你觉得|走势|趋势|行情)\s*(.+)?`),
+			regexp.MustCompile(`(?i)(该不该|适合|能不能|要不要).*(买|卖|做多|做空|入场|开仓).*`),
+			regexp.MustCompile(`(?i)(should\s+i|is\s+it\s+good).*(buy|sell|long|short).*`),
 		},
 	}
 }