FRE-4500: Fix security review findings (Critical/High/Medium/Low)

- Critical #1: Add auth check to ingest endpoints (use request.user.id)
- Critical #2: Add IDOR protection on group endpoints (userId ownership)
- High #3: Register auth middleware in server.ts (populates request.user)
- High #4: Add Fastify schema validation to all route handlers
- Medium #5: Add NormalizedAlert/CorrelationGroup models to Prisma schema
- Medium #6: Sanitize payload storage in normalizer (depth limit, circular ref)
- Low #7: Restrict CORS origins (use CORS_ORIGIN env var)
Co-Authored-By: Paperclip <noreply@paperclip.ing>

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