[AZ-1132] Bump FluentValidation 12.0.0 to 12.1.1

Closes D-AZ795-1 production dependency carry-over.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/05_security/security_report_cycle15.md

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+# Security Audit Report (Cycle 15)
+
+**Date**: 2026-06-26
+**Scope**: Cycle-15 delta — AZ-1132 (FluentValidation bump / D-AZ795-1 closure).
+**Trigger**: Implement batch — dependency hardening (Step 14 audit pending).
+**Verdict (cycle-15 delta)**: **PASS** — D-AZ795-1 resolved; 0 new Critical/High/Medium.
+**Verdict (cumulative)**: **PASS_WITH_WARNINGS** — D2-cy4 remains open.
+
+## Summary
+
+| Severity | Cycle 15 at audit | Cumulative open |
+|----------|-------------------|-----------------|
+| Critical | 0 | 0 |
+| High | 0 | 0 |
+| Medium | 0 | 1 (D2-cy4 test-runtime) |
+| Low | 0 (D-AZ795-1 resolved) | 0 |
+
+## Findings
+
+| # | Severity | Category | Location | Title | Status |
+|---|----------|----------|----------|-------|--------|
+| D-AZ795-1 | Low | Dependency | `SatelliteProvider.Api` FluentValidation packages | Pin at 12.0.0 | **RESOLVED** (AZ-1132 → 12.1.1) |
+
+## Carry-overs (still open)
+
+- **D2-cy4** — test SDK transitive JWT advisory (Moderate, test-runtime only)
+
+## Recommendations
+
+### Immediate
+- None blocking cycle 15 ship.
+
+### Short-term
+- D2-cy4: pin JWT test packages when upstream resolves GHSA-59j7-ghrg-fj52 for 7.0.3 line.
+
+## Artifacts
+
+- `dependency_scan_cycle15.md`