feat: merge display-fix — touch driver, keyboard, WiFi setup UI

Squash-merge of feature/display-fix (27 commits):
- AXS15231B touch driver with coordinate parsing (touch.c/h)
- On-screen keyboard with layout/hit detection (keyboard.c/h)
- WiFi setup state machine + config_add_wifi (wifi_setup.c/h)
- Web-based WiFi setup via captive portal
- Display rotation fix (stride=480), color fixes, DMA byte-swap
- WiFi QR code on BOOT and ERROR screens
- ERROR state transition after WiFi retries exhausted
- Unit tests: test_touch, test_keyboard, test_wifi_setup
- Integration test: wifi_setup.mjs
- E2E test: wifi-setup.spec.mjs
- Per-board hardware locks for flash targets

Conflicts resolved: took master for config/cvm/api/main (more current),
took display-fix for display/axs15231b (newer fixes).

1 files changed, 29 insertions, 0 deletions

diff --git a/main/touch.h b/main/touch.h
new file mode 100644
index 0000000..b9e3ccd
--- /dev/null
+++ b/main/touch.h
@@ -0,0 +1,29 @@
+#ifndef TOUCH_H
+#define TOUCH_H
+
+#include "esp_err.h"
+#include <stdint.h>
+#include <stdbool.h>
+
+#define TOUCH_SDA_PIN    4
+#define TOUCH_SCL_PIN    8
+#define TOUCH_RST_PIN    12
+#define TOUCH_INT_PIN    11
+#define TOUCH_I2C_ADDR   0x3B
+#define TOUCH_MAX_X      319
+#define TOUCH_MAX_Y      479
+
+typedef struct {
+    uint16_t x;
+    uint16_t y;
+    bool touched;
+} touch_point_t;
+
+esp_err_t touch_init(void);
+bool touch_read(touch_point_t *pt);
+void touch_deinit(void);
+void touch_set_rotation(int rotation);
+
+void touch_parse_raw(const uint8_t *data, touch_point_t *pt);
+
+#endif