feat: power manager with battery monitoring, LED warnings, and sleep modes

Co-authored-by: Cursor <cursoragent@cursor.com>

src/main.cpp

@@ -3,9 +3,11 @@
 #include "config.h"
 #include "settings.h"
 #include "wifi_manager.h"
+#include "power_manager.h"
 
 SettingsManager settingsManager;
 WiFiManager wifiManager;
+PowerManager powerManager;
 
 void setup() {
     auto cfg = M5.config();
@@ -14,21 +16,18 @@ void setup() {
     Serial.begin(115200);
     Serial.println("[main] Immich Frame booting...");
 
-    pinMode(PIN_AUDIO_PWR_EN, OUTPUT);
-    digitalWrite(PIN_AUDIO_PWR_EN, LOW);
-    pinMode(PIN_SPK_EN, OUTPUT);
-    digitalWrite(PIN_SPK_EN, LOW);
-
+    powerManager.begin();
     settingsManager.begin();
     wifiManager.begin(settingsManager);
 
-    Serial.printf("[main] WiFi mode: %s, IP: %s\n",
-                  wifiManager.isAPMode() ? "AP" : "Station",
-                  wifiManager.getIP().c_str());
+    Serial.printf("[main] Battery: %d%%, Charging: %s\n",
+                  powerManager.getBatteryPercent(),
+                  powerManager.isCharging() ? "yes" : "no");
     Serial.println("[main] Boot complete");
 }
 
 void loop() {
     M5.update();
+    powerManager.updateBatteryLED();
     delay(1000);
 }