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, 44 insertions, 0 deletions

diff --git a/tests/unit/stubs/driver/gpio.h b/tests/unit/stubs/driver/gpio.h
new file mode 100644
index 0000000..d8dda0a
--- /dev/null
+++ b/tests/unit/stubs/driver/gpio.h
@@ -0,0 +1,44 @@
+#ifndef STUBS_DRIVER_GPIO_H
+#define STUBS_DRIVER_GPIO_H
+
+#include <stdint.h>
+
+typedef enum {
+    GPIO_MODE_DISABLE = 0,
+    GPIO_MODE_INPUT,
+    GPIO_MODE_OUTPUT,
+    GPIO_MODE_OUTPUT_OD,
+    GPIO_MODE_INPUT_OUTPUT_OD,
+    GPIO_MODE_INPUT_OUTPUT,
+} gpio_mode_t;
+
+typedef enum {
+    GPIO_INTR_DISABLE = 0,
+} gpio_int_type_t;
+
+typedef enum {
+    GPIO_PULLUP_DISABLE = 0,
+    GPIO_PULLUP_ENABLE,
+} gpio_pullup_t;
+
+typedef enum {
+    GPIO_PULLDOWN_DISABLE = 0,
+    GPIO_PULLDOWN_ENABLE,
+} gpio_pulldown_t;
+
+typedef struct {
+    uint64_t pin_bit_mask;
+    gpio_mode_t mode;
+    gpio_pullup_t pull_up_en;
+    gpio_pulldown_t pull_down_en;
+    gpio_int_type_t intr_type;
+} gpio_config_t;
+
+static inline int gpio_config(const gpio_config_t *cfg) { (void)cfg; return 0; }
+static inline int gpio_set_level(uint32_t gpio_num, uint32_t level) { (void)gpio_num; (void)level; return 0; }
+
+#define GPIO_INTR_DISABLE 0
+#define GPIO_PULLUP_DISABLE 0
+#define GPIO_PULLDOWN_DISABLE 0
+
+#endif