fix(P3): 3 priority-3 fixes — timezone, decay rounding, rate limiter

#16  Timezone consistency — added TZ=Europe/Sofia to docker-compose.yml
     so datetime.now() returns local time inside the container. Removed
     the +3 hour hack from get_time_of_day(). All three time-of-day
     consumers (autonomous_v1_legacy, moods, autonomous_engine) now
     use the same correct local hour automatically.

#17  Decay truncation — replaced int() with round() in decay_events()
     so a counter of 1 survives one more 15-minute cycle instead of
     being immediately zeroed (round(0.841)=1 vs int(0.841)=0).

#20  Unpersisted rate limiter — _last_action_execution dict in
     autonomous.py is now seeded from the engine's persisted
     server_last_action on import, so restarts don't bypass the
     30-second cooldown.

Note: #18 (dead config fields) was a false positive — autonomous_interval_minutes
IS used by the scheduler. #19 deferred to bipolar mode rework.

bot/utils/autonomous_v1_legacy.py

@@ -682,7 +682,7 @@ def save_last_sent_tweets():
         logger.error(f"Failed to save last sent tweets: {e}")
 
 def get_time_of_day():
-    hour = datetime.now().hour + 3
+    hour = datetime.now().hour
     if 5 <= hour < 12:
         return "morning"
     elif 12 <= hour < 18: