Fix bot routine scheduling field mismatch and add debug logging

Bot was sending days_of_week/times but API expects days/time, so
bot-scheduled routines never got reminders. Also handle NULL frequency
from pre-migration rows and add detailed logging to routine reminder
checks for diagnosing further issues.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bot/commands/routines.py

@@ -217,12 +217,13 @@ async def handle_routine(message, session, parsed):
             await message.channel.send("When should this routine be scheduled? (e.g., 'Monday Wednesday Friday at 7am')")
             return
 
-        # Build schedule data
+        # Build schedule data (API expects "days" and "time")
         schedule_data = {}
         if days_of_week:
-            schedule_data["days_of_week"] = days_of_week
+            schedule_data["days"] = days_of_week
         if times:
-            schedule_data["times"] = times
+            schedule_data["time"] = times[0]
+            schedule_data["remind"] = True
 
         resp, status = api_request("put", f"/api/routines/{routine_id}/schedule", token, schedule_data)
         if status == 200: