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, 34 insertions, 7 deletions

diff --git a/Makefile b/Makefile
index 7de799e..2ed8e07 100644
--- a/Makefile
+++ b/Makefile
@@ -20,7 +20,7 @@ PYTHON ?= python3
 .PHONY: help setup detect-ports detect-chip detect-all
 .PHONY: flash flash-a flash-b monitor monitor-a monitor-b
 .PHONY: test smoke test-api test-portal test-network test-full
-.PHONY: tokens test-payment
+.PHONY: tokens test-payment wallet-setup wallet-info wallet-balance mint-token send-token
 .PHONY: clean erase-nvs reset serial-log
 .PHONY: bootstrap-config
 
@@ -47,7 +47,12 @@ help:
         @echo "  test-full         All 14 Phase 1 tests"
         @echo ""
         @echo "Test (Phase 2):"
-        @echo "  tokens            Mint test Cashu tokens (AMOUNT=21)"
+        @echo "  wallet-setup      Initialize nutshell wallet for test mint"
+        @echo "  wallet-info       Show mint info"
+        @echo "  wallet-balance    Show wallet balance"
+        @echo "  mint-token        Invoice + send test token (AMOUNT=21)"
+        @echo "  send-token        Send cashuA token (AMOUNT=21)"
+        @echo "  tokens            Alias for send-token"
         @echo "  test-payment      Payment flow tests"
         @echo ""
         @echo "Utilities:"
@@ -165,17 +170,39 @@ test-full: test-api test-portal test-network
         @echo "=== Full test suite passed ==="
 
 # ──────────────────────────────────────────────
-# Phase 2: Payment Testing
+# Phase 2: Payment Testing (Nutshell wallet)
 # ──────────────────────────────────────────────
 
-tokens:
-        @echo "=== Minting test tokens from $(TEST_MINT) ==="
+wallet-setup:
+        @echo "=== Setting up Nutshell wallet for $(TEST_MINT) ==="
+        cashu --env-mint $(TEST_MINT) info 2>/dev/null || \
+                cashu --env-mint $(TEST_MINT) restore
+
+wallet-info:
+        @echo "=== Mint info ==="
+        cashu --env-mint $(TEST_MINT) info
+
+wallet-balance:
+        @echo "=== Wallet balance ==="
+        cashu --env-mint $(TEST_MINT) balance
+
+mint-token:
+        @echo "=== Minting test token (AMOUNT=$(or $(AMOUNT),21)) ==="
         @AMOUNT=$${AMOUNT:-21}; \
-        cd scripts/mint-token && go run main.go -mint https://$(TEST_MINT) -amount $$AMOUNT
+        cashu --env-mint $(TEST_MINT) invoice $$AMOUNT && \
+        echo "--- Token (cashuA legacy) ---" && \
+        cashu --env-mint $(TEST_MINT) send --legacy $$AMOUNT
+
+send-token:
+        @AMOUNT=$${AMOUNT:-21}; \
+        echo "=== Sending $$AMOUNT sats as cashuA token ===" && \
+        cashu --env-mint $(TEST_MINT) send --legacy $$AMOUNT
+
+tokens: send-token
 
 test-payment:
         @echo "=== Running payment tests ==="
-        $(NODE) tests/payment.mjs
+        $(NODE) tests/phase2.mjs
 
 # ──────────────────────────────────────────────
 # Utilities