Implement batched database operations for improved performance

- Add BatchedDatabaseHandler that batches prefix, ASN, and peering operations
- Add BatchedPeerHandler that batches peer update operations
- Batch operations are deduped and flushed every 100-200ms or when batch size is reached
- Add EnableBatchedDatabaseWrites config option (enabled by default)
- Properly flush remaining batches on shutdown
- This significantly reduces database write pressure and improves throughput

internal/config/config.go

@@ -24,6 +24,9 @@ type Config struct {
 
 	// MaxRuntime is the maximum runtime (0 = run forever)
 	MaxRuntime time.Duration
+
+	// EnableBatchedDatabaseWrites enables batched database operations for better performance
+	EnableBatchedDatabaseWrites bool
 }
 
 // New creates a new Config with default paths based on the OS
@@ -34,8 +37,9 @@ func New() (*Config, error) {
 	}
 
 	return &Config{
-		StateDir:   stateDir,
-		MaxRuntime: 0, // Run forever by default
+		StateDir:                    stateDir,
+		MaxRuntime:                  0,    // Run forever by default
+		EnableBatchedDatabaseWrites: true, // Enable batching by default for better performance
 	}, nil
 }