Connection registry

Now we can use leak sanitizer. Yay!

src/server.hpp

@@ -2,6 +2,7 @@
 
 #include "config.hpp"
 #include "connection_handler.hpp"
+#include "connection_registry.hpp"
 #include <atomic>
 #include <memory>
 #include <span>
@@ -99,8 +100,10 @@ private:
   const weaseldb::Config &config_;
   ConnectionHandler &handler_;
 
-  // Thread management
-  std::vector<std::thread> threads_;
+  // Connection registry
+  ConnectionRegistry connection_registry_;
+
+  // Connection management
   std::atomic<int64_t> connection_id_{0};
 
   // Round-robin counter for connection distribution
@@ -122,14 +125,14 @@ private:
   void setup_signal_handling();
   int create_listen_socket();
   void create_epoll_instances();
-  void start_io_threads();
+  void start_io_threads(std::vector<std::thread> &threads);
   void cleanup_resources();
 
   // Helper to get epoll fd for a thread using round-robin
   int get_epoll_for_thread(int thread_id) const;
 
   // Helper for processing connection I/O
-  void process_connection_io(std::unique_ptr<Connection> &conn, int events);
+  void process_connection_io(std::unique_ptr<Connection> &conn_ptr, int events);
 
   // Helper for processing a batch of connections with their events
   void process_connection_batch(int epollfd,