Erinnerungen & Routinen (A3): Wecker in MC2 + Hermes-Tools

- services/reminders.py: persistenter Store (/srv/models/mc2-reminders.json),
  Wecker-Loop feuert in Briefkasten (Lucy spricht) + Telegram; repeat
  daily/weekdays/weekly; naive Zeiten = Commander-TZ (Europe/Berlin, Box ist UTC);
  verpasste Einmal-Erinnerungen feuern verspätet nach (ehrlich markiert)
- routers/reminders.py: GET/POST/DELETE /api/reminders
- mcp_mc.py: reminder_create/list/delete (Guards, ISO aus Sofort-Kontext)
- announce.notify_telegram als gemeinsamer Helper (sentry nutzt ihn jetzt)
- requirements: tzdata (zoneinfo-Fallback, Windows-Dev)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/routers/reminders.py

@@ -0,0 +1,37 @@
+"""Erinnerungen & Routinen (A3) — dünner REST-Layer über services/reminders.py.
+Konsument ist v.a. der Hermes-Agent via mcp_mc.py (reminder_create/list/delete);
+LAN-only wie alle MC2-Endpoints."""
+
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel
+
+from services import reminders
+
+router = APIRouter(prefix="/api")
+
+
+class ReminderIn(BaseModel):
+    text: str          # was angesagt werden soll
+    when: str          # ISO-8601; ohne Offset = Commander-Zeitzone (Europe/Berlin)
+    repeat: str = ""   # '' einmalig | daily | weekdays | weekly
+
+
+@router.get("/reminders")
+def list_reminders() -> dict:
+    return {"items": reminders.list_all()}
+
+
+@router.post("/reminders")
+def create_reminder(body: ReminderIn) -> dict:
+    try:
+        return {"ok": True, "item": reminders.create(body.text, body.when, body.repeat)}
+    except ValueError as exc:
+        raise HTTPException(400, str(exc))
+
+
+@router.delete("/reminders/{reminder_id}")
+def delete_reminder(reminder_id: int) -> dict:
+    try:
+        return {"ok": True, "deleted": reminders.delete(reminder_id)}
+    except KeyError as exc:
+        raise HTTPException(404, str(exc.args[0]))