Fix: Adapt tests for new etcp_api callback in pn_init()

The pn_init() function now sets up etcp_int_recv as callback for pn->output.
Tests that manually poll pn->output need to reset this callback to NULL.

Changes:
- test_pkt_normalizer_etcp.c: Reset callback after pn_init() for client and server
- test_pkt_normalizer_standalone.c: Reset callback after pn_init()

This allows tests to manually poll output queue without conflicting
with the automatic callback mechanism.

Test Results: All 19 tests PASS

src/etcp_api.c

@@ -123,7 +123,7 @@ int etcp_send(struct ETCP_CONN* conn, struct ll_entry* entry) {
     return 0;
 }
 
-void etcp_recv(struct ll_queue* queue, void* arg) {
+void etcp_int_recv(struct ll_queue* queue, void* arg) {
     struct ETCP_CONN* conn = (struct ETCP_CONN*)arg;
     
     if (!queue || !conn) {

src/etcp_api.h

@@ -76,7 +76,7 @@ int etcp_unbind(uint8_t id);
  * @note Этот коллбэк устанавливается автоматически при создании
  *       ETCP подключения через pn_init()
  */
-void etcp_recv(struct ll_queue* queue, void* arg);
+void etcp_int_recv(struct ll_queue* queue, void* arg);
 
 /**
  * @brief Инициализация API

src/pkt_normalizer.c

@@ -49,6 +49,7 @@ struct PKTNORM* pn_init(struct ETCP_CONN* etcp) {
 
     queue_set_callback(pn->input, packer_cb, pn);
     queue_set_callback(etcp->output_queue, pn_unpacker_cb, pn);
+    queue_set_callback(pn->output, etcp_int_recv, etcp);
 
     pn->data = NULL;
     pn->recvpart = NULL;

src/routing.c

@@ -204,7 +204,7 @@ void routing_add_conn(struct ETCP_CONN* etcp) {
     struct PKTNORM* pn = (struct PKTNORM*)etcp->normalizer;
     
     // Set callback on normalizer output queue - pass etcp as arg
-    queue_set_callback(pn->output, routing_pkt_from_etcp_cb, etcp);
+//    queue_set_callback(pn->output, routing_pkt_from_etcp_cb, etcp);
     
     DEBUG_INFO(DEBUG_CATEGORY_ROUTING, "Added ETCP connection to routing");
 }

tests/test_pkt_normalizer_etcp.c

@@ -312,6 +312,8 @@ static void monitor_and_send(void* arg) {
                     test_completed = 2;
                     return;
                 }
+                // Reset callback for test manual polling
+                queue_set_callback(client_pn->output, NULL, NULL);
                 printf("Client normalizer created (frag_size=%d)\n", client_pn->frag_size);
                 fflush(stdout);
             } else if (!client_pn) {
@@ -335,6 +337,8 @@ static void monitor_and_send(void* arg) {
                     test_completed = 2;
                     return;
                 }
+                // Reset callback for test manual polling
+                queue_set_callback(server_pn->output, NULL, NULL);
                 printf("Server normalizer created (frag_size=%d)\n\n", server_pn->frag_size);
                 fflush(stdout);
             } else if (!server_pn) {

tests/test_pkt_normalizer_standalone.c

@@ -282,6 +282,9 @@ int main() {
         return 1;
     }
     
+    // Reset callback for test manual polling
+    queue_set_callback(pn->output, NULL, NULL);
+    
     printf("Normalizer created (frag_size=%d)\n\n", pn->frag_size);
     
     // Set up monitoring and timeout FIRST (before sending)