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_test.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"bytes"
+	"log/slog"
+	"strings"
+	"testing"
+
+	"bd2server/internal/server/logging"
+)
+
+func TestServeLoggingOverridesEnvironmentAndEnablesTrace(t *testing.T) {
+	previous := slog.Default()
+	t.Cleanup(func() { slog.SetDefault(previous) })
+	t.Setenv("BD2_LOG_LEVEL", "warn")
+	t.Setenv("BD2_LOG_COLOR", "never")
+	var output bytes.Buffer
+	if err := configureLogging(&output, "trace", "always"); err != nil {
+		t.Fatal(err)
+	}
+	logging.Trace("trace enabled")
+	slog.Info("existing callers use new handler")
+	if !strings.Contains(output.String(), "\x1b[90mTRACE\x1b[0m") || !strings.Contains(output.String(), "\x1b[32mINFO\x1b[0m") {
+		t.Fatalf("log output=%q", output.String())
+	}
+	output.Reset()
+	if err := configureLogging(&output, "", ""); err != nil {
+		t.Fatal(err)
+	}
+	slog.Info("filtered")
+	slog.Warn("plain warning")
+	if strings.Contains(output.String(), "filtered") || strings.Contains(output.String(), "\x1b[") || !strings.Contains(output.String(), "level=WARN") {
+		t.Fatalf("env log output=%q", output.String())
+	}
+}