Add web auth, infinite-scroll, agent admission and review fixes across agent/server/web

server/monlet_server/settings.py

@@ -1,4 +1,4 @@
-from pydantic import field_validator
+from pydantic import Field, field_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 from .timeutil import validate_time_zone
@@ -40,6 +40,7 @@ class Settings(BaseSettings):
     notifier_batch_size: int = 20
     notifier_max_attempts: int = 8
     notifier_lease_sec: int = 300
+    notifier_concurrency: int = Field(default=4, ge=1)
     notifier_http_timeout_sec: float = 10.0
     notification_time_zone: str = "UTC"