first commit. added CI, Docker compose, blank client and server. used unit tests, they pass

server/internal/platform/logger/logger.go

@@ -0,0 +1,19 @@
+// Package logger provides a structured JSON logger built on log/slog.
+// In development a human-readable text handler is used.
+package logger
+
+import (
+	"log/slog"
+	"os"
+)
+
+// New returns a *slog.Logger configured for the current environment.
+func New() *slog.Logger {
+	level := slog.LevelDebug
+
+	handler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
+		Level: level,
+	})
+
+	return slog.New(handler)
+}