Phase 5: Lightning auto-payout with LNURL-pay and NUT-05 melt

- New lnurl_pay.c/h: LNURL-pay protocol (GET .well-known/lnurlp + callback)
- New lightning_payout.c/h: threshold-based auto-payout with multi-recipient split
- Extended nucula_wallet bridge with nucula_wallet_melt() (NUT-05)
- Config: payout section with multi-mint, multi-recipient, fee_tolerance
- Default: enabled, TollGate@coinos.io, min_payout=128, min_balance=64
- 18 new unit tests (all passing), 134 total

1 files changed, 4 insertions, 0 deletions

diff --git a/main/tollgate_main.c b/main/tollgate_main.c
index d4dcf0d..3f83923 100644
--- a/main/tollgate_main.c
+++ b/main/tollgate_main.c
@@ -20,6 +20,7 @@
 #include "nucula_wallet.h"
 #include "wifistr.h"
 #include "tollgate_client.h"
+#include "lightning_payout.h"
 
 #define MAX_STA_RETRY 5
 static const char *TAG = "tollgate_main";
@@ -89,6 +90,8 @@ static void ip_event_handler(void *arg, esp_event_base_t event_base,
         const tollgate_config_t *cfg = tollgate_config_get();
         nucula_wallet_init(cfg->mint_url);
 
+        lightning_payout_init(&cfg->payout);
+
         char gw_ip_str[16];
         snprintf(gw_ip_str, sizeof(gw_ip_str), IPSTR, IP2STR(&event->ip_info.gw));
         tollgate_client_on_sta_connected(gw_ip_str);
@@ -282,5 +285,6 @@ void app_main(void)
         vTaskDelay(pdMS_TO_TICKS(1000));
         session_tick();
         tollgate_client_tick();
+        lightning_payout_tick();
     }
 }