fix: expose local ports in compose and auto-load .env in config package

internal/config/config.go

@@ -1,12 +1,46 @@
 package config
 
 import (
+	"bufio"
 	"os"
 	"strconv"
 	"strings"
 	"time"
 )
 
+func init() {
+	loadDotEnv()
+}
+
+func loadDotEnv() {
+	file, err := os.Open(".env")
+	if err != nil {
+		return
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		key := strings.TrimSpace(parts[0])
+		val := strings.TrimSpace(parts[1])
+		if (strings.HasPrefix(val, "\"") && strings.HasSuffix(val, "\"")) ||
+			(strings.HasPrefix(val, "'") && strings.HasSuffix(val, "'")) {
+			val = val[1 : len(val)-1]
+		}
+		if os.Getenv(key) == "" {
+			os.Setenv(key, val)
+		}
+	}
+}
+
 type Config struct {
 	Host     string
 	Port     string