Add timed bidding support with countdown displays and debug view

- Added `bidding_duration` field to `DraftSessionSettings` model and migration.
- Updated `DraftStateManager` to manage bidding start/end times using session settings.
- Extended WebSocket payloads to include bidding timer data.
- Added `DraftCountdownClock` React component and integrated into admin and participant UIs.
- Created new `DraftDebug` view, template, and front-end component for real-time state debugging.
- Updated utility functions to handle new timer fields in draft state.
- Changed script tags in templates to load with `defer` for non-blocking execution.

draft/models.py

@@ -62,6 +62,7 @@ class DraftSessionSettings(Model):
     draft_session = OneToOneField(
         DraftSession, on_delete=CASCADE, related_name="settings"
     )
+    bidding_duration = IntegerField(default=90)
 
     def __str__(self):
         return f"Settings for {self.draft_session}"