Fix stack overflow and heap-allocate large buffers in Cashu/payment path

- tollgate_api.c: increase httpd stack_size to 16384 (was default 4096)
- cashu.c: heap-allocate b64, json_buf, post_body, resp_buf instead of stack
- cashu.c: proper free() on all error paths
- Makefile: replace Go-based tokens target with nutshell wallet targets
- Makefile: add wallet-setup, wallet-info, wallet-balance, mint-token, send-token

1 files changed, 1 insertions, 0 deletions

diff --git a/main/tollgate_api.c b/main/tollgate_api.c
index 5ada3c7..b2ad647 100644
--- a/main/tollgate_api.c
+++ b/main/tollgate_api.c
@@ -330,6 +330,7 @@ esp_err_t tollgate_api_start(void)
     config.server_port = 2121;
     config.ctrl_port = 32769;
     config.max_uri_handlers = 10;
+    config.stack_size = 16384;
 
     esp_err_t ret = httpd_start(&s_api_server, &config);
     if (ret != ESP_OK) {