Add ntfy push notifications with action buttons for meal reminders

- ntfy.py: send_meal_reminder() with Home/Out HTTP action buttons, test helper
- models.py: new columns ntfy_url, ntfy_token, callback_token on users table
- meals.py: /api/ntfy-callback (public, token-authenticated), /ntfy-settings, /ntfy-test
- app.py: flask send-reminders CLI command (cron-schedulable)
- Dashboard: ntfy config form in Account Settings
- i18n: translations for all ntfy strings (en/fr/de)
- Dockerfile: include ntfy.py in COPY
- tests: 15 new tests covering callback, settings, and auth
- docs: updated AGENTS.md and doc/index.md

models.py

@@ -69,6 +69,12 @@ def init_db() -> None:
         if "household_id" not in cols:
             db.execute("ALTER TABLE users ADD COLUMN household_id INTEGER REFERENCES households(id)")
             db.execute("CREATE INDEX IF NOT EXISTS idx_users_household ON users(household_id)")
+        if "ntfy_url" not in cols:
+            db.execute("ALTER TABLE users ADD COLUMN ntfy_url TEXT DEFAULT ''")
+        if "ntfy_token" not in cols:
+            db.execute("ALTER TABLE users ADD COLUMN ntfy_token TEXT DEFAULT ''")
+        if "callback_token" not in cols:
+            db.execute("ALTER TABLE users ADD COLUMN callback_token TEXT DEFAULT ''")
 
 
 # ── Households ────────────────────────────────────────────────────────────────
@@ -174,6 +180,52 @@ def get_household_users(household_id: int) -> list[dict]:
         return [dict(r) for r in rows]
 
 
+# ── Ntfy / notifications ─────────────────────────────────────────────────────
+
+def set_user_ntfy(user_id: int, ntfy_url: str, ntfy_token: str,
+                  callback_token: str) -> None:
+    """Save ntfy settings for a user."""
+    with get_db() as db:
+        db.execute(
+            "UPDATE users SET ntfy_url = ?, ntfy_token = ?, callback_token = ? "
+            "WHERE id = ?",
+            (ntfy_url, ntfy_token, callback_token, user_id),
+        )
+
+
+def get_user_ntfy(user_id: int) -> dict:
+    """Get ntfy settings for a user."""
+    with get_db() as db:
+        row = db.execute(
+            "SELECT ntfy_url, ntfy_token, callback_token FROM users WHERE id = ?",
+            (user_id,),
+        ).fetchone()
+        return dict(row) if row else {}
+
+
+def get_user_by_callback_token(token: str) -> dict | None:
+    """Look up a user by their ntfy callback token."""
+    with get_db() as db:
+        row = db.execute(
+            "SELECT id, username, household_id FROM users WHERE callback_token = ?",
+            (token,),
+        ).fetchone()
+        return dict(row) if row else None
+
+
+def get_users_with_ntfy(household_id: int) -> list[dict]:
+    """Return all users in a household who have ntfy configured."""
+    with get_db() as db:
+        rows = db.execute(
+            "SELECT id, username, ntfy_url, ntfy_token, callback_token "
+            "FROM users WHERE household_id = ? "
+            "AND ntfy_url != '' AND callback_token != '' "
+            "ORDER BY username",
+            (household_id,),
+        ).fetchall()
+        return [dict(r) for r in rows]
+
+
 # ── Meal periods ──────────────────────────────────────────────────────────────
 
 def ensure_meal_periods(for_date: date) -> list[dict]: