feat(resilience): baseline vs stress scoring engine (#2821)

* feat(resilience): baseline vs stress scoring engine

Splits the resilience index into structural capacity (baselineScore)
and active disruption (stressScore) using the dimension type tags from
RESILIENCE_DIMENSION_TYPES (baseline/stress/mixed).

overallScore = baselineScore * (1 - stressFactor) where stressFactor
is clamped to [0, 0.5]. Mixed dimensions contribute to both scores.

Proto fields 10-12 added (baseline_score, stress_score, stress_factor).
Widget updated to display baseline/stress breakdown.
Cache keys bumped v4 -> v5 for atomic rollout.

* fix(resilience): bump history key to v2 for baseline/stress formula change

The overallScore formula changed from domain-weighted-sum to
baselineScore * (1 - stressFactor). Old history entries are
incomparable, causing fake change30d drops of -20 to -30 points.
Versioned history key starts a clean series.

docs/api/ResilienceService.openapi.yaml

@@ -121,6 +121,15 @@ components:
                 imputationShare:
                     type: number
                     format: double
+                baselineScore:
+                    type: number
+                    format: double
+                stressScore:
+                    type: number
+                    format: double
+                stressFactor:
+                    type: number
+                    format: double
         ResilienceDomain:
             type: object
             properties: