Add time parsing, exact alarm notifications, boot reschedule

Time parsing:
- 12-hour format: 5pm, 2:30pm, 11am, 12am (midnight), 12pm (noon)
- 24-hour format: 14:30, 9:00, 17:00
- Time extracted alongside date: "@today 3pm p1 #work"
- Time cleaned from display text
- dueTime field added to Task domain model (LocalTime?)

Notification scheduling:
- Tasks with specific time: AlarmManager.setExactAndAllowWhileIdle at
  that exact time
- Tasks with date only: two alarms at 8am and 8pm on the due date
- SecurityException fallback to inexact alarm if permission denied
- TaskAlarmReceiver fires notification when alarm triggers
- BootReceiver re-schedules WorkManager on device reboot

Permissions added:
- SCHEDULE_EXACT_ALARM, USE_EXACT_ALARM for AlarmManager
- RECEIVE_BOOT_COMPLETED for reschedule after reboot

Test suite: 76 tests (38 TaskParser, 16 DtoMappers, 7 Serialization,
7 Backup, 5 Visibility, 3 ApiResult), all passing.

9 new time parsing tests: 12h am/pm, 12h with minutes, 24h, midnight,
noon, no time returns null, time+date combo, time cleaned from text.

Co-Authored-By: Claude Opus 4.6 (1M context)

Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

androidApp/src/main/AndroidManifest.xml

@@ -3,6 +3,9 @@
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
+    <uses-permission android:name="android.permission.USE_EXACT_ALARM" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
     <application
         android:allowBackup="true"
@@ -23,6 +26,18 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <receiver
+            android:name="com.avinal.memos.notifications.TaskAlarmReceiver"
+            android:exported="false" />
+
+        <receiver
+            android:name="com.avinal.memos.notifications.BootReceiver"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
     </application>
 
 </manifest>