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Add two new optional configuration values to support multi-instance deployments:
source_prefix(default: "MISP")source_attribute(default: "event_uuid")
The sighting source is now built dynamically as:
f"{source_prefix}/{attribute.<source_attribute>}"
If the configured attribute is missing, the code falls back to event_uuid.
This preserves existing behaviour by default while allowing per-instance configuration (e.g. "MISP-Paris/event_id", "MISP-Lyon/orgc_id"), making it easier to distinguish sightings originating from different MISP servers.