Build and harden security operations case manager

[chasejstone]

Summary

• Add incident, evidence, analysis, correlation, user, report, and audit workflows
• Integrate pinned Crucible and PacketLens analyzers through Celery and Redis jobs
• Store investigations and a hash-chained audit history in PostgreSQL
• Add Docker services, security headers, CI, architecture notes, and deployment guidance
• Enforce administrator-only incident assignment
• Reject known production placeholder credentials and database passwords
• Classify packet captures by file signature instead of extension
• Remove unused vendor-specific hosting scaffolding
• Replace showcase-style interface copy with direct operations language

Checks

• npm run lint
• npm test (2 tests and a production build)
• npm audit --audit-level=high (0 vulnerabilities)
• Backend pytest (9 tests)
• Compose validation and container builds in CI