feat: add fzf-based file/plugin/port selection and update build system

client/src/carla_host.c

@@ -1,3 +1,5 @@
+#define _GNU_SOURCE
+#include <stdlib.h>
 #include <CarlaHost.h>
 #include <CarlaBackend.h>
 #include <string.h>
@@ -206,6 +208,48 @@ int carla_disconnect_plugin(int id) {
     return any ? 0 : -1;  // return -1 if no connections were found (harmless)
 }
 
+#ifdef MOCK_JACK
+/* Mock: return a few fake port names */
+int carla_get_ports(const char *type, char ***ports, int *count) {
+    (void)type;
+    static const char *fake[] = {"system:capture_1", "system:capture_2", "system:playback_1", "system:playback_2"};
+    *count = 4;
+    *ports = malloc(*count * sizeof(char*));
+    if (!*ports) { *count = 0; return -1; }
+    for (int i = 0; i < *count; i++)
+        (*ports)[i] = strdup(fake[i]);
+    return 0;
+}
+#else
+#include <jack/jack.h>
+int carla_get_ports(const char *type, char ***ports, int *count) {
+    (void)type;
+    if (!jack_client) {
+        *ports = NULL;
+        *count = 0;
+        return -1;
+    }
+    const char **jports = jack_get_ports(jack_client, NULL, NULL, 0);
+    if (!jports) {
+        *ports = NULL;
+        *count = 0;
+        return -1;
+    }
+    int n = 0;
+    while (jports[n]) n++;
+    *count = n;
+    *ports = malloc(n * sizeof(char*));
+    if (!*ports) {
+        jack_free(jports);
+        return -1;
+    }
+    for (int i = 0; i < n; i++)
+        (*ports)[i] = strdup(jports[i]);
+    jack_free(jports);
+    return 0;
+}
+#endif
+
 #ifdef TESTING
 int carla_test_connection_count(void) {
     return conn_count;