feat: web-based WiFi setup via captive portal, portrait-only display

- Remove touchscreen WiFi setup (touch.c, keyboard.c, wifi_setup.c from build)
- Remove offscreen buffer and landscape rotation from axs15231b driver
- Add /setup HTML page with WiFi scan/connect via captive portal
- Add /wifi/scan, /wifi/connect, /wifi/status HTTP endpoints
- Display shows SETUP_PENDING (QR + SSID + setup URL) when unconfigured
- Display shows ERROR with setup URL when upstream is down
- All 101 unit tests pass, builds and flashes to Board C

1 files changed, 1 insertions, 2 deletions

diff --git a/main/display.h b/main/display.h
index e8824b6..ecb76b6 100644
--- a/main/display.h
+++ b/main/display.h
@@ -10,7 +10,7 @@ typedef enum {
     DISPLAY_READY,
     DISPLAY_PAYMENT_RECEIVED,
     DISPLAY_ERROR,
-    DISPLAY_WIFI_SETUP
+    DISPLAY_SETUP_PENDING
 } display_state_t;
 
 typedef enum {
@@ -27,7 +27,6 @@ void display_update(const char *ap_ssid, int active_clients,
 void display_notify_payment(int amount_sats, int64_t allotment_ms);
 void display_notify_wifi_connected(const char *ip);
 void display_notify_wifi_disconnected(void);
-void display_enter_wifi_setup(void);
 void display_render_text(int x, int y, const char *text, uint16_t fg, uint16_t bg, int scale);
 void display_render_qr(const char *text);