refactored bot code

bot/handlers/init.py

@@ -0,0 +1,14 @@
+from . import start, students, teachers, common
+from bot.callbacks.init import register_all_callbacks
+
+
+def register_all_handlers(bot):
+    """Register all handlers and callbacks"""
+    # Message handlers
+    start.register(bot)
+    students.register(bot)
+    teachers.register(bot)
+    common.register(bot)  # Must be last (catch-all)
+
+    # Callback handlers
+    register_all_callbacks(bot)