v0.12.4

Changelog

• a0b1693 Merge pull request #1 from devs-group/feat/security-scanner
• ac1950f Merge remote-tracking branch 'origin/main' into feat/security-scanner
• a3dde97 feat(scanner): add registry-level scan gate with async background worker
• c5fbf15 feat(scanner): add security scanner for uploaded skills
• f8e81eb feat: add is_service flag to API keys for cross-tenant access
• 1a8a938 fix(lint): resolve all golangci-lint and gosec findings
• 7f274b7 fix(lint): resolve remaining errcheck and staticcheck findings
• 1847e06 fix(security): resolve remaining P1 issues — file upload limits, recursive CTE, transaction boundaries
• 70eb01d improve(scanner): enrich LLM system prompt with full platform context