feat: Massnahmen-Bibliothek auf 200 erweitert (3-Stufen)

60 Design + 80 Schutz + 60 Information — alle mit Normenreferenzen.
Subtypes: geometry, force_energy, material, ergonomics, control_design,
fixed_guard, movable_guard, electro_sensitive, emergency_stop,
electrical/thermal/fluid protection, extraction, signage, manual,
training, ppe, organizational, marking.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ai-compliance-sdk/internal/iace/models_api.go

@@ -177,6 +177,7 @@ type ProtectiveMeasureEntry struct {
 	Description    string   `json:"description"`
 	HazardCategory string   `json:"hazard_category,omitempty"`
 	Examples       []string `json:"examples,omitempty"`
+	NormReferences []string `json:"norm_references,omitempty"`
 	Tags           []string `json:"tags,omitempty"`
 }