refactor: remove IMU and button init calls from app_main

Remove button_Init(), imu_manager_init(), and
imu_manager_set_shake_callback() calls from mimi.c along with
their corresponding include directives.

Signed-off-by: Asklv <boironic@gmail.com>

main/mimi.c

@@ -23,8 +23,6 @@
 #include "tools/tool_registry.h"
 #include "cron/cron_service.h"
 #include "heartbeat/heartbeat.h"
-#include "buttons/button_driver.h"
-#include "imu/imu_manager.h"
 #include "skills/skill_loader.h"
 
 static const char *TAG = "mimi";
@@ -110,11 +108,6 @@ void app_main(void)
     ESP_LOGI(TAG, "PSRAM free:    %d bytes",
              (int)heap_caps_get_free_size(MALLOC_CAP_SPIRAM));
 
-    /* Input */
-    button_Init();
-    imu_manager_init();
-    imu_manager_set_shake_callback(NULL);
-
     /* Phase 1: Core infrastructure */
     ESP_ERROR_CHECK(init_nvs());
     ESP_ERROR_CHECK(esp_event_loop_create_default());