v0.4.7 - Implement NIP-70 Protected Events - Add protected event support with authentication checks, comprehensive testing, and relay metadata protection

src/config.h

@@ -40,6 +40,7 @@ typedef struct {
     int nip42_mode;
     int nip42_challenge_timeout;
     int nip42_time_tolerance;
+    int nip70_protected_events_enabled;
     
     // Static buffer for config values (replaces static buffers in get_config_value functions)
     char temp_buffer[CONFIG_VALUE_MAX_LENGTH];