Add spider functionality for relay crawling, marker management, and new SpiderMode config.

- Introduced the `spider` package for relay crawling, including periodic tasks and one-time sync capabilities.
- Added `SetMarker`, `GetMarker`, `HasMarker`, and `DeleteMarker` methods in the database for marker management.
- Updated configuration with `SpiderMode` and `SpiderFrequency` options to enable and customize spider behavior.
- Integrated `spider` initialization into the main application flow.
- Improved tag handling, NIP-70 compliance, and protected tag validation in event processing.
- Removed unnecessary logging and replaced `errorf` with `fmt.Errorf` for better error handling.
- Incremented version to `v0.5.0`.

app/handle-websocket.go

@@ -97,7 +97,7 @@ whitelist:
 		}
 		var typ websocket.MessageType
 		var msg []byte
-		log.T.F("waiting for message from %s", remote)
+		// log.T.F("waiting for message from %s", remote)
 
 		// Create a read context with timeout to prevent indefinite blocking
 		readCtx, readCancel := context.WithTimeout(ctx, DefaultReadTimeout)
@@ -152,7 +152,7 @@ whitelist:
 			writeCancel()
 			continue
 		}
-		log.T.F("received message from %s: %s", remote, string(msg))
+		// log.T.F("received message from %s: %s", remote, string(msg))
 		go listener.HandleMessage(msg, remote)
 	}
 }