[bojemoi_boot] image-pusher: add Phase 3 to build locally-built images from Dockerfiles

Commit `a5b1d18`

Add build_local_images() (Phase 3) covering 16 custom images: borodino, koursk, koursk-2, ml-threat-intel, telegram-bot, vigie, dozor, razvedka, medved, karacho, tsushima, oblast, oblast-1, provisioning, suricata-attack-enricher, pentest-orchestrator
Mount /opt/bojemoi, /opt/bojemoi-telegram, /opt/bojemoi-ml-threat as read-only volumes in image-pusher so Dockerfiles are accessible
Skip build if image already present in registry (idempotent)
Add external mappings: redis-exporter, faraday, nuclei
Mark all custom-built images as SKIP in get_source_image() (Phase 2)
Fix suricata_exporter mapping (was corelight/, now SKIP/custom-built)

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com