fix: start with zero servers when config is missing or corrupt

Removed _create_default_config() which hardcoded a specific guild ID
(759889672804630530) as a fallback. Now:
- Missing servers_config.json → starts with empty servers dict
- Corrupt JSON → logs error, starts with empty servers dict
- Servers are added via the API/dashboard, not by magic defaults

All code that iterates server_manager.servers handles empty dicts safely.

bot/server_manager.py

@@ -94,9 +94,9 @@ class ServerManager:
                 self.repair_config()
             except Exception as e:
                 logger.error(f"Failed to load server config: {e}")
-                self._create_default_config()
+                logger.info("Starting with zero servers — add servers via the API or dashboard")
         else:
-            self._create_default_config()
+            logger.info("No servers_config.json found — starting with zero servers")
     
     def repair_config(self):
         """Repair corrupted configuration data and save it back"""
@@ -122,22 +122,6 @@ class ServerManager:
         except Exception as e:
             logger.error(f"Failed to repair config: {e}")
     
-    def _create_default_config(self):
-        """Create default configuration for backward compatibility"""
-        default_server = ServerConfig(
-            guild_id=759889672804630530,
-            guild_name="Default Server",
-            autonomous_channel_id=761014220707332107,
-            autonomous_channel_name="miku-chat",
-            bedtime_channel_ids=[761014220707332107],
-            enabled_features={"autonomous", "bedtime", "monday_video"},
-            autonomous_interval_minutes=10,
-            conversation_detection_interval_minutes=3
-        )
-        self.servers[default_server.guild_id] = default_server
-        self.save_config()
-        logger.info("Created default server configuration")
-    
     def save_config(self):
         """Save server configurations to file"""
         try: