refactor: mover .go de tipos Go a functions/{domain}/ para compilación unificada

Los archivos .go de tipos ahora viven junto a las funciones en functions/{domain}/
(mismo paquete Go), resolviendo errores de compilación por tipos no encontrados
(Option, Pair, Result, etc.). Los .md de metadata permanecen en types/{domain}/
con file_path actualizado a functions/. Se elimina types.go duplicado de infra.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

functions/finance/bollinger_result.go

@@ -0,0 +1,8 @@
+package finance
+
+// BollingerResult holds the three bands of a Bollinger Bands calculation.
+type BollingerResult struct {
+	Upper  []float64
+	Middle []float64
+	Lower  []float64
+}

functions/finance/drawdown_result.go

@@ -0,0 +1,8 @@
+package finance
+
+// DrawdownResult holds the maximum drawdown value and the indices where it occurred.
+type DrawdownResult struct {
+	Value float64
+	Start int
+	End   int
+}

functions/finance/ohlcv.go

@@ -0,0 +1,10 @@
+package finance
+
+// OHLCV represents a market candle with open, high, low, close prices and volume.
+type OHLCV struct {
+	Open   float64
+	High   float64
+	Low    float64
+	Close  float64
+	Volume float64
+}

functions/finance/tick.go

@@ -0,0 +1,11 @@
+package finance
+
+import "time"
+
+// Tick represents a single trade event in a market.
+type Tick struct {
+	Symbol    string
+	Price     float64
+	Volume    float64
+	Timestamp time.Time
+}