fix(android): remove startForegroundService from BootReceiver (crash on boot)

ForegroundService requires a live Flutter engine and cannot be cold-started
from a BroadcastReceiver. flutter_foreground_task handles boot-restart
internally via autoRunOnBoot=true. BootReceiver now only reschedules
the AlarmManager chain.

frontend/android/app/src/main/kotlin/com/teamsb/tis_rms/BootReceiver.kt

@@ -3,7 +3,6 @@ package com.teamsb.tis_rms
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
-import com.pravera.flutter_foreground_task.service.ForegroundService
 
 class BootReceiver : BroadcastReceiver() {
     override fun onReceive(context: Context, intent: Intent) {
@@ -11,8 +10,6 @@ class BootReceiver : BroadcastReceiver() {
         if (action == Intent.ACTION_BOOT_COMPLETED ||
             action == "android.intent.action.QUICKBOOT_POWERON"
         ) {
-            val serviceIntent = Intent(context, ForegroundService::class.java)
-            context.startForegroundService(serviceIntent)
             AlarmScheduler.schedule(context)
         }
     }