Created a new constants.py file to store the REACTIONS dictionary

Updated all files to import REACTIONS from constants.py instead of reactions.py:
queue_processor.py
message_handler.py
reactions.py (now only contains reaction handling functions)
events.py (now imports REACTIONS from constants.py and handle_archived_reaction from reactions.py)
core.py
queue_handler.py
processor/init.py

videoarchiver/processor/constants.py

@@ -0,0 +1,13 @@
+"""Constants for VideoProcessor"""
+
+# Reaction emojis
+REACTIONS = {
+    'queued': '📹',
+    'processing': '⚙️',
+    'success': '✅',
+    'error': '❌',
+    'archived': '🔄',  # New reaction for already archived videos
+    'numbers': ['1️⃣', '2️⃣', '3️⃣', '4️⃣', '5️⃣'],
+    'progress': ['⬛', '🟨', '🟩'],
+    'download': ['0️⃣', '2️⃣', '4️⃣', '6️⃣', '8️⃣', '🔟']
+}