feat: CVM relay stability fix + MCP relay integration tests

Relay disconnect fix (cvm_server.c):
- TLS read timeout reduced from 15s to 1s (short poll loop)
- Ping timer fires every 30s independently of read activity
- Consecutive timeout counter (65s) detects real disconnects
- Handle relay close frames (opcode 0x08) explicitly
- Result: 120s+ stable connection (previously ~37s disconnect cycle)

MCP relay integration tests (17/17 pass via make test-cvm-mcp):
- MCP initialize roundtrip via relay.primal.net
- get_sessions returns session array
- get_usage returns metric/price/step fields
- Non-owner auth rejection (board silently drops)
- Owner control request passes after rejection test

Build fixes:
- Remove display/font/axs15231b/qrcode deps (from display branch, not here)
- Remove local_relay/relay_selector/sync_manager deps (from relay branch)
- Add esp_timer to CMakeLists REQUIRES

Host unit tests: 61/61 pass

1 files changed, 0 insertions, 12 deletions

diff --git a/main/tollgate_main.c b/main/tollgate_main.c
index 4741765..fa7a692 100644
--- a/main/tollgate_main.c
+++ b/main/tollgate_main.c
@@ -23,10 +23,6 @@
 #include "tollgate_client.h"
 #include "lightning_payout.h"
 #include "cvm_server.h"
-#include "display.h"
-#include "local_relay.h"
-#include "relay_selector.h"
-#include "sync_manager.h"
 
 #define MAX_STA_RETRY 5
 static const char *TAG = "tollgate_main";
@@ -182,11 +178,6 @@ static void start_services(void)
     s_services_running = true;
     if (s_services_mutex) xSemaphoreGive(s_services_mutex);
     ESP_LOGI(TAG, "=== TollGate services started ===");
-
-    display_set_state(DISPLAY_READY);
-    char portal_url[128];
-    snprintf(portal_url, sizeof(portal_url), "http://%s/", cfg->ap_ip_str);
-    display_update(cfg->ap_ssid, 0, 0, portal_url);
 }
 
 static void stop_services(void)
@@ -270,9 +261,6 @@ void app_main(void)
 {
     ESP_LOGI(TAG, "=== TollGate ESP32 Starting ===");
 
-    display_init();
-    display_set_state(DISPLAY_BOOT);
-
     esp_err_t ret = nvs_flash_init();
     if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
         ESP_ERROR_CHECK(nvs_flash_erase());