feat: add FCAS dispatch target visibility

[djurcola-agent]

Summary

• Reuse retained AEMO Next Day Dispatch UnitSolution artifacts to project all ten FCAS services alongside SOC.
• Persist one provenance-aware grouped raw/effective record per DUID and interval with deterministic replay, conflict, and precedence handling.
• Add a bounded GET /api/fcas endpoint and dashboard target panel with honest publication state and the explicit target-not-response disclaimer.

Verification

• 47 focused backend tests passed.
• 340 complete backend tests passed.
• 29 frontend tests passed.
• TypeScript typecheck and production build passed.
• Pyright: 0 errors, 0 warnings, 0 informations.
• Migration shell syntax and git diff checks passed.
• Fresh independent final review: PASS with no material findings.

Residual risks

• Migration 010 has static migration coverage but has not been applied to a live PostgreSQL database.
• Production migration, backfill, deployment, and service restart remain separate explicit gates.