docs: 移除 SGM3833 升压负压芯片，更新 P3.4 引脚为 LCD_PWR_CTRL 直接背光供电控制

Docs/60_coding/mod-lcd.md

@@ -133,6 +133,6 @@ void UI_ShowPairConfirmPage(u8 type, u8 selected_suffix) {
     LCD_ShowStringCentered(165, num_buf, COLOR_CYAN, COLOR_BLACK);
 }
 
-<!-- Checked and verified with always-on screen and sleep removal changes -->
+<!-- Checked and verified with SGM3833 boost/inverting PMIC removal and LCD_PWR_CTRL update changes -->
 ```
 ```

Docs/60_coding/mod-power.md

@@ -9,15 +9,15 @@
 ## 2. 关键代码片段与逻辑实现
 
 ### 2.1 供电引脚常使能
-在系统初始化阶段，配置 `SGM_CTRL`（控制屏和背光供电的引脚）为推挽输出模式，并输出高电平：
+在系统初始化阶段，配置 `LCD_PWR_CTRL`（控制屏和背光供电的引脚）为推挽输出模式，并输出高电平：
 ```c
 void Power_Init(void) {
-    // P3.4 (SGM_CTRL) 配置为推挽输出
+    // P3.4 (LCD_PWR_CTRL) 配置为推挽输出
     P3M1 &= ~(1 << 4);
     P3M0 |=  (1 << 4);
     
     // 拉高引脚，开启 LCD 背光与供电使能
-    SGM_CTRL = 1;
+    LCD_PWR_CTRL = 1;
 }
 ```