feat(logging): integrate spdlog for enhanced logging and debugging

- Added spdlog dependency to `CMakeLists.txt`.
- Implemented a centralized `Logger` with file rotation and console output support.
- Added detailed logging across server, client, and game modules for improved traceability.

src/common/Logger.cpp

@@ -0,0 +1,42 @@
+/**
+ * @file Logger.cpp
+ */
+#include "Logger.h"
+
+#include <filesystem>
+#include <memory>
+
+#include <spdlog/sinks/rotating_file_sink.h>
+#include <spdlog/sinks/stdout_color_sinks.h>
+#include <spdlog/spdlog.h>
+
+namespace fs = std::filesystem;
+
+namespace UNO::COMMON {
+    void Logger::init(const std::string &app_name, const std::string &log_dir)
+    {
+        fs::path dir{log_dir};
+        if (!fs::exists(dir)) {
+            fs::create_directories(dir);
+        }
+
+        auto logfile = (dir / (app_name + ".log")).string();
+
+        constexpr std::size_t max_file_size = 5 * 1024 * 1024;
+        constexpr std::size_t max_files     = 3;
+
+        auto rotating_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt>(logfile, max_file_size, max_files);
+        auto console_sink  = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
+
+        rotating_sink->set_level(spdlog::level::debug);
+        console_sink->set_level(spdlog::level::info);
+
+        std::vector<spdlog::sink_ptr> sinks{rotating_sink, console_sink};
+        auto logger = std::make_shared<spdlog::logger>(app_name, sinks.begin(), sinks.end());
+
+        logger->set_pattern("[%Y-%m-%d %H:%M:%S.%e] [%^%l%$] [%s:%#] [%!] %v");
+
+        spdlog::register_logger(logger);
+        spdlog::set_default_logger(logger);
+    }
+}   // namespace UNO::COMMON