Fix issues #8, #9, #10, #11: scheduling conflicts, med reminders, adaptive timing, nagging

- #11: Add validation to prevent simultaneous scheduling of routines and medications
  - Added _check_schedule_conflicts() in routines.py
  - Added _check_med_schedule_conflicts() in medications.py
  - Returns HTTP 409 with descriptive error on conflict

- #10: Fix medication reminders not being sent
  - Added call to check_adaptive_medication_reminders() in daemon poll loop

- #9: Fix can't enable adaptive timing
  - Added proper error handling and logging in update_adaptive_settings()
  - Returns meaningful error message on database failures

- #8: Fix nagging not working
  - Added debug logging for missing settings
  - Auto-create medication schedules if they don't exist
  - Improved error logging (warning -> error)

api/routes/adaptive_meds.py

@@ -2,12 +2,15 @@
 api/routes/adaptive_meds.py - API endpoints for adaptive medication settings
 """
 
+import logging
 import flask
 import jwt
 import os
 import core.postgres as postgres
 import core.adaptive_meds as adaptive_meds
 
+logger = logging.getLogger(__name__)
+
 JWT_SECRET = os.getenv("JWT_SECRET")
 
 
@@ -99,18 +102,25 @@ def register(app):
             "quiet_hours_end": data.get("quiet_hours_end"),
         }
 
-        # Check if settings exist
-        existing = adaptive_meds.get_adaptive_settings(user_uuid)
+        try:
+            # Check if settings exist
+            existing = adaptive_meds.get_adaptive_settings(user_uuid)
 
-        if existing:
-            postgres.update(
-                "adaptive_med_settings", update_data, {"user_uuid": user_uuid}
-            )
-        else:
-            update_data["user_uuid"] = user_uuid
-            postgres.insert("adaptive_med_settings", update_data)
+            if existing:
+                postgres.update(
+                    "adaptive_med_settings", update_data, {"user_uuid": user_uuid}
+                )
+            else:
+                update_data["user_uuid"] = user_uuid
+                postgres.insert("adaptive_med_settings", update_data)
 
-        return flask.jsonify({"success": True}), 200
+            return flask.jsonify({"success": True}), 200
+        except Exception as e:
+            logger.error(f"Failed to save adaptive settings: {e}")
+            return flask.jsonify({
+                "error": "Failed to save settings",
+                "details": str(e)
+            }), 500
 
     @app.route("/api/adaptive-meds/presence", methods=["GET"])
     def get_presence_status():