feat: add reactions, bookmarks, polls modules with session remember config

Add three new feature modules (reactions, bookmarks, polls) with corresponding database tables, indexes, and router registrations. Introduce `SESSION_MAX_AGE_REMEMBER` config for extended session duration, add `get_unread_messages` template global, and include operational defaults for rate limiting and session settings in `site_settings`.

devplacepy/push.py

@@ -20,6 +20,7 @@ from cryptography.hazmat.primitives.hashes import SHA256
 from cryptography.hazmat.primitives.kdf.hkdf import HKDF
 
 from devplacepy.config import (
+    SECONDS_PER_DAY,
     VAPID_PRIVATE_KEY_FILE,
     VAPID_PRIVATE_KEY_PKCS8_FILE,
     VAPID_PUBLIC_KEY_FILE,
@@ -31,7 +32,7 @@ from devplacepy.utils import generate_uid
 logger = logging.getLogger(__name__)
 
 JWT_LIFETIME_SECONDS = 60 * 60
-PUSH_TTL_SECONDS = "86400"
+PUSH_TTL_SECONDS = str(SECONDS_PER_DAY)
 DEAD_SUBSCRIPTION_STATUSES = (404, 410)
 ACCEPTED_STATUSES = (200, 201)