map debug + coord backfill, remove email channel, countdown label

- Surface "X/Y passende Wohnungen mit Koordinaten" on the Karte view +
  admin-only "Koordinaten nachladen" button (POST /actions/backfill-coords)
  that geocodes missing flats via Google Maps directly from the web container
- Add googlemaps dep + GMAPS_API_KEY env to web service
- Light console.log in map.js ("rendering N/M markers", "building Leaflet…")
  so the browser DevTools shows what's happening
- Drop e-mail channel from notifications UI, notify dispatcher, and _alert_status;
  coerce legacy 'email' channel rows back to 'ui' on save
- Countdown said "Aktualisierung läuft…" next to "nächste Aktualisierung" →
  shortened to "aktualisiere…"

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/notifications.py

@@ -4,25 +4,14 @@ User-level notification dispatcher.
 Channels:
 - 'ui'       → no-op (dashboard shows the events anyway)
 - 'telegram' → per-user bot token + chat id
-- 'email'    → system SMTP (one outbox, per-user recipient)
 """
 import logging
-import smtplib
-from email.mime.text import MIMEText
 from typing import Optional
 
 import requests
 
 import db
-from settings import (
-    PUBLIC_URL,
-    SMTP_FROM,
-    SMTP_HOST,
-    SMTP_PASSWORD,
-    SMTP_PORT,
-    SMTP_STARTTLS,
-    SMTP_USERNAME,
-)
+from settings import PUBLIC_URL
 
 logger = logging.getLogger("web.notifications")
 
@@ -46,28 +35,6 @@ def _telegram_send(token: str, chat_id: str, text: str) -> bool:
         return False
 
 
-def _email_send(recipient: str, subject: str, body: str) -> bool:
-    if not SMTP_HOST or not recipient:
-        logger.info("email skipped (SMTP_HOST=%r recipient=%r)", SMTP_HOST, recipient)
-        return False
-    try:
-        msg = MIMEText(body, _charset="utf-8")
-        msg["Subject"] = subject
-        msg["From"] = SMTP_FROM
-        msg["To"] = recipient
-        with smtplib.SMTP(SMTP_HOST, SMTP_PORT, timeout=15) as s:
-            if SMTP_STARTTLS:
-                s.starttls()
-            if SMTP_USERNAME:
-                s.login(SMTP_USERNAME, SMTP_PASSWORD)
-            s.send_message(msg)
-        logger.info("email sent to %s", recipient)
-        return True
-    except Exception as e:
-        logger.warning("email send failed: %s", e)
-        return False
-
-
 def _should_notify(notif, event: EventType) -> bool:
     if event == "match":
         return bool(notif["notify_on_match"])
@@ -86,17 +53,11 @@ def notify_user(user_id: int, event: EventType, *,
         if not notif or not _should_notify(notif, event):
             return
         channel = notif["channel"] or "ui"
-        if channel == "ui":
-            return
         if channel == "telegram":
             token = notif["telegram_bot_token"]
             chat = notif["telegram_chat_id"]
             if token and chat:
                 _telegram_send(token, chat, body_markdown or body_plain)
-        elif channel == "email":
-            addr = notif["email_address"]
-            if addr:
-                _email_send(addr, subject, body_plain)
     except Exception:
         logger.exception("notify_user failed for user=%s event=%s", user_id, event)