feat(gci): add Gesamt-Compliance-Index scoring engine and dashboard

Implements the 4-level GCI scoring model (Module -> Risk-Weighted -> Regulation Area -> Final GCI)
with DSGVO, NIS2, ISO 27001, and EU AI Act integration.

Backend:
- 9 Go files: engine, models, weights, validity, NIS2 roles/scoring, ISO mapping/gap-analysis, mock data
- GCI handlers with 13 API endpoints under /sdk/v1/gci/
- Routes registered in main.go

Frontend:
- TypeScript types, API client, Next.js API proxy
- Dashboard page with 6 tabs (Overview, Breakdown, NIS2, ISO 27001, Matrix, Audit Trail)
- Sidebar navigation entry

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ai-compliance-sdk/internal/gci/weights.go

@@ -0,0 +1,78 @@
+package gci
+
+// WeightProfile defines regulation weights for different compliance profiles
+type WeightProfile struct {
+	ID          string             `json:"id"`
+	Name        string             `json:"name"`
+	Description string             `json:"description"`
+	Weights     map[string]float64 `json:"weights"` // regulation_id -> weight (0.0-1.0)
+}
+
+// Default weight profiles
+var DefaultProfiles = map[string]WeightProfile{
+	"default": {
+		ID:          "default",
+		Name:        "Standard",
+		Description: "Ausgewogenes Profil fuer allgemeine Compliance",
+		Weights: map[string]float64{
+			"dsgvo":    0.30,
+			"nis2":     0.25,
+			"iso27001": 0.25,
+			"ai_act":   0.20,
+		},
+	},
+	"nis2_relevant": {
+		ID:          "nis2_relevant",
+		Name:        "NIS2-relevant",
+		Description: "Fuer Betreiber kritischer Infrastrukturen",
+		Weights: map[string]float64{
+			"dsgvo":    0.25,
+			"nis2":     0.35,
+			"iso27001": 0.25,
+			"ai_act":   0.15,
+		},
+	},
+	"ki_nutzer": {
+		ID:          "ki_nutzer",
+		Name:        "KI-Nutzer",
+		Description: "Fuer Organisationen mit KI-Einsatz",
+		Weights: map[string]float64{
+			"dsgvo":    0.25,
+			"nis2":     0.25,
+			"iso27001": 0.20,
+			"ai_act":   0.30,
+		},
+	},
+}
+
+// ModuleRiskWeights defines risk criticality per module type
+var ModuleRiskWeights = map[string]float64{
+	"incident_response":    3.0,
+	"management_awareness": 3.0,
+	"data_protection":      2.5,
+	"it_security":          2.5,
+	"supply_chain":         2.0,
+	"risk_assessment":      2.0,
+	"access_control":       2.0,
+	"business_continuity":  2.0,
+	"employee_training":    1.5,
+	"documentation":        1.5,
+	"physical_security":    1.0,
+	"general":              1.0,
+}
+
+// GetProfile returns a weight profile by ID, defaulting to "default"
+func GetProfile(profileID string) WeightProfile {
+	if p, ok := DefaultProfiles[profileID]; ok {
+		return p
+	}
+	return DefaultProfiles["default"]
+}
+
+// GetModuleRiskWeight returns the risk weight for a module category
+func GetModuleRiskWeight(category string) float64 {
+	if w, ok := ModuleRiskWeights[category]; ok {
+		return w
+	}
+	return 1.0
+}