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13548deae8
Deleting a template with prune_images, deleting an image, or pruning
orphan images only checked template references — a project node still
pointing at the image (e.g. via hda_disk_image_backing_file) was left
with a dangling reference and the project could no longer be opened.
- Add controller helpers scanning every known project (opened projects
via in-memory nodes, closed projects via their .gns3 file) for
template and image usage; unreadable topologies are skipped
- Guard DELETE /templates/{id}, DELETE /templates/{id}?prune_images,
DELETE /images/{path} and /images/prune with a 409 listing the
project names
- Run all template-delete checks before any mutation so a refused
deletion cannot leave the template gone while its images survive