feat(server): add colored logs, level rewards, hunting dispatch and fiend hunt

Persist claims, AP, teams and presets with session receipts and atomic request rollback. Read rewards and growth from GameData; replace fixed Fiend Hunt user state and preserve the account initialization contract.

go/cmd/bd2server/logging.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"io"
+
+	"bd2server/internal/server/logging"
+)
+
+func configureLogging(writer io.Writer, levelOverride, colorOverride string) error {
+	options, err := logging.OptionsFromEnv()
+	if err != nil {
+		return err
+	}
+	if levelOverride != "" {
+		options.Level, err = logging.ParseLevel(levelOverride)
+		if err != nil {
+			return err
+		}
+	}
+	if colorOverride != "" {
+		options.Color, err = logging.ParseColorMode(colorOverride)
+		if err != nil {
+			return err
+		}
+	}
+	_, err = logging.Setup(writer, options)
+	return err
+}