Refactor activity system: energy-based probability, manual override, all 5 activity types

- Rewrite utils/activities.py with mood energy-driven activity probability
  (high-energy moods like excited/bubbly show activity ~80-85% of the time,
  low-energy moods like sleepy/melancholy only ~15-25%)
- Add manual override system with 30-min auto-expiry for Web UI control
- Support all 5 Discord activity types: listening, playing, watching,
  competing, streaming (with purple LIVE badge via discord.Streaming)
- Add current activity tracking (get_current_activity)
- Add force=True param to update_bot_presence for on_ready (bot.py)
- Add 4 new API routes for manual override:
  GET/POST/DELETE /activities/current, POST /activities/current/auto
- Expand activities.yaml from 139 to 157 entries, adding watching,
  competing, and streaming entries across 11 moods
- Update Web UI: activity type dropdown with all 5 types, conditional
  URL field for streaming, 'Current Activity' override panel with
  set/clear/auto controls, type-aware icons and labels

bot/bot.py

@@ -140,9 +140,9 @@ async def on_ready():
     try:
         from utils.activities import update_bot_presence
         if globals.EVIL_MODE:
-            await update_bot_presence(globals.EVIL_DM_MOOD, is_evil=True)
+            await update_bot_presence(globals.EVIL_DM_MOOD, is_evil=True, force=True)
         else:
-            await update_bot_presence(globals.DM_MOOD, is_evil=False)
+            await update_bot_presence(globals.DM_MOOD, is_evil=False, force=True)
     except Exception as e:
         logger.error(f"Failed to set initial presence: {e}")