feat: add logging system and debug audio routing

Co-authored-by: aider (deepseek/deepseek-coder) <aider@aider.chat>

main.c

@@ -10,6 +10,7 @@
 #include "dispatcher.h"
 #include "carla.h"
 #include "fs.h"
+#include "logging.h"
 
 static Engine engine;
 static volatile int keep_running = 1;
@@ -129,6 +130,10 @@ int main(int argc, char *argv[]) {
     dispatch = dispatcher_init(initial_state);
     free(initial_state);
     
+    // Initialize logging
+    log_init("jack-looper.log", LOG_LEVEL_DEBUG);
+    LOG_INFO("JACK Looper starting...");
+    
     // Initialize filesystem module (auto-save thread)
     fs_init();
     
@@ -192,6 +197,7 @@ int main(int argc, char *argv[]) {
     engine_cleanup(&engine);
     fs_cleanup();
     dispatcher_stop();
+    log_cleanup();
     
     return 0;
 }