etcp_connections: improve INIT diagnostics (demote spam, add type/source/fields)

- 1556: Normal decryption failed -> DEBUG_DEBUG (expected for INIT, no more spam)
- 1581: added 'INIT X25519 OK from %s' with source address
- 1604-1617: INFO log for decrypted packet type (PING/PONG/INIT) with peer_id+src
- 1662-1668: expanded INIT accepted log with all fields:
  peer_id, mtu, link_id, socket_id, type, only_local, src_ip:src_port,
  session_id, actual src (UDP) — shows NAT mismatch

src/etcp_connections.c

@@ -1553,7 +1553,7 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
             goto process_decrypted;
         }
         // Normal decryption failed - might be INIT packet, fall through to INIT handling
-        DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "Normal decryption failed, trying INIT decryption");
+        DEBUG_DEBUG(DEBUG_CATEGORY_CONNECTION, "Normal decryption failed, trying INIT decryption");
     }
     
     // Try INIT decryption (for incoming connection requests)
@@ -1578,6 +1578,7 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
         errorcode=2; 
         goto ec_fr; 
     }
+    DEBUG_INFO(DEBUG_CATEGORY_CRYPTO, "INIT X25519 OK from %s", sockaddr_storage_to_str(&addr).str);
     if (sc_decrypt(&sc, data, recv_len - SC_PUBKEY_ENC_SIZE, (uint8_t*)&pkt->timestamp, &pkt_len)) {
         DEBUG_ERROR(DEBUG_CATEGORY_CRYPTO, "failed to decrypt init packet, from %s", sockaddr_storage_to_str(&addr).str);
         errorcode=3; 
@@ -1601,11 +1602,15 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
     uint8_t code = pkt->data[0];
     uint64_t peer_id = be64toh(*(uint64_t*)(pkt->data + 1));
     if (code == ETCP_PING) {
+        DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "INIT decrypted: PING from peer=0x%016llx src=%s",
+                   (unsigned long long)peer_id, sockaddr_storage_to_str(&addr).str);
         int ret = handle_ping(e_sock, pkt, &addr, decrypted_pubkey, pkt_len);
         if (ret) { errorcode = ret; goto ec_fr; }
         return;
     }
     if (code == ETCP_PONG) {
+        DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "INIT decrypted: PONG from peer=0x%016llx src=%s",
+                   (unsigned long long)peer_id, sockaddr_storage_to_str(&addr).str);
         int ret = handle_pong(e_sock, pkt, &addr, pkt_len);
         if (ret) { errorcode = ret; goto ec_fr; }
         return;
@@ -1652,7 +1657,15 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
 
     struct ETCP_INIT_REQUEST_PKT* req = (struct ETCP_INIT_REQUEST_PKT*)pkt->data;
     uint32_t session_id = be32toh(*(uint32_t*)req->session_id);
-    DEBUG_DEBUG(DEBUG_CATEGORY_CONNECTION, "INIT request session_id=%08x", session_id);
+    uint16_t mtu = be16toh(*(uint16_t*)req->mtu);
+    uint16_t src_port = be16toh(*(uint16_t*)req->src_port);
+    DEBUG_INFO(DEBUG_CATEGORY_CONNECTION,
+               "INIT accepted: peer=0x%016llx mtu=%u link=%u sock=%u type=%d local=%d"
+               " src_ip=%d.%d.%d.%d:%u session=%08x src=%s",
+               (unsigned long long)peer_id, mtu, req->link_id, req->socket_id,
+               req->type, req->only_local,
+               req->src_ipv4[0], req->src_ipv4[1], req->src_ipv4[2], req->src_ipv4[3],
+               src_port, session_id, sockaddr_storage_to_str(&addr).str);
 
     struct ETCP_CONN* conn=e_sock->instance->connections;
     while (conn) {// ищем есть ли подключение к этому пиру