refactor: increase dispatch throttle duration for improved queue processing

backend/.env.example

@@ -22,5 +22,5 @@ DB_AUTO_MIGRATE=false
 # Generic RQ queue / dispatch settings
 RQ_REDIS_URL=redis://localhost:6379/0
 RQ_QUEUE_NAME=default
-RQ_DISPATCH_THROTTLE_SECONDS=2.0
+RQ_DISPATCH_THROTTLE_SECONDS=15.0
 RQ_DISPATCH_MAX_RETRIES=3

backend/app/core/config.py

@@ -56,7 +56,7 @@ class Settings(BaseSettings):
     # RQ queueing / dispatch
     rq_redis_url: str = "redis://localhost:6379/0"
     rq_queue_name: str = "default"
-    rq_dispatch_throttle_seconds: float = 2.0
+    rq_dispatch_throttle_seconds: float = 15.0
     rq_dispatch_max_retries: int = 3
     rq_dispatch_retry_base_seconds: float = 10.0
     rq_dispatch_retry_max_seconds: float = 120.0