feat: reporting dashboard — case stats, deadline compliance, workload, billing (P1)

Backend:
- ReportingService with aggregation queries (CTEs, FILTER clauses)
- 4 API endpoints: /api/reports/{cases,deadlines,workload,billing}
- Date range filtering via ?from=&to= query params

Frontend:
- /berichte page with 4 tabs: Akten, Fristen, Auslastung, Abrechnung
- recharts: bar/pie/line charts for all report types
- Date range picker, CSV export, print-friendly view
- Sidebar nav entry with BarChart3 icon

Also resolves merge conflicts between role-based, notification, and
audit trail branches, and adds missing TS types (AuditLogResponse,
Notification, NotificationPreferences).

backend/internal/auth/context.go

@@ -9,19 +9,11 @@ import (
 type contextKey string
 
 const (
-<<<<<<< HEAD
 	userIDKey    contextKey = "user_id"
 	tenantIDKey  contextKey = "tenant_id"
+	userRoleKey  contextKey = "user_role"
 	ipKey        contextKey = "ip_address"
 	userAgentKey contextKey = "user_agent"
-||||||| 82878df
-	userIDKey   contextKey = "user_id"
-	tenantIDKey contextKey = "tenant_id"
-=======
-	userIDKey   contextKey = "user_id"
-	tenantIDKey contextKey = "tenant_id"
-	userRoleKey contextKey = "user_role"
->>>>>>> mai/pike/p0-role-based
 )
 
 func ContextWithUserID(ctx context.Context, userID uuid.UUID) context.Context {
@@ -41,7 +33,15 @@ func TenantFromContext(ctx context.Context) (uuid.UUID, bool) {
 	id, ok := ctx.Value(tenantIDKey).(uuid.UUID)
 	return id, ok
 }
-<<<<<<< HEAD
+
+func ContextWithUserRole(ctx context.Context, role string) context.Context {
+	return context.WithValue(ctx, userRoleKey, role)
+}
+
+func UserRoleFromContext(ctx context.Context) string {
+	role, _ := ctx.Value(userRoleKey).(string)
+	return role
+}
 
 func ContextWithRequestInfo(ctx context.Context, ip, userAgent string) context.Context {
 	ctx = context.WithValue(ctx, ipKey, ip)
@@ -62,15 +62,3 @@ func UserAgentFromContext(ctx context.Context) *string {
 	}
 	return nil
 }
-||||||| 82878df
-=======
-
-func ContextWithUserRole(ctx context.Context, role string) context.Context {
-	return context.WithValue(ctx, userRoleKey, role)
-}
-
-func UserRoleFromContext(ctx context.Context) string {
-	role, _ := ctx.Value(userRoleKey).(string)
-	return role
-}
->>>>>>> mai/pike/p0-role-based

backend/internal/auth/middleware.go

@@ -35,36 +35,8 @@ func (m *Middleware) RequireAuth(next http.Handler) http.Handler {
 		}
 
 		ctx := ContextWithUserID(r.Context(), userID)
-<<<<<<< HEAD
 		// Tenant resolution is handled by TenantResolver middleware for scoped routes.
 		// Tenant management routes handle their own access control.
-||||||| 82878df
-
-		// Resolve tenant and role from user_tenants
-		var membership struct {
-			TenantID uuid.UUID `db:"tenant_id"`
-			Role     string    `db:"role"`
-		}
-		err = m.db.GetContext(r.Context(), &membership,
-			"SELECT tenant_id, role FROM user_tenants WHERE user_id = $1 LIMIT 1", userID)
-		if err != nil {
-			http.Error(w, "no tenant found for user", http.StatusForbidden)
-			return
-		}
-		ctx = ContextWithTenantID(ctx, membership.TenantID)
-		ctx = ContextWithUserRole(ctx, membership.Role)
-
-=======
-
-		// Resolve tenant from user_tenants
-		var tenantID uuid.UUID
-		err = m.db.GetContext(r.Context(), &tenantID,
-			"SELECT tenant_id FROM user_tenants WHERE user_id = $1 LIMIT 1", userID)
-		if err != nil {
-			http.Error(w, "no tenant found for user", http.StatusForbidden)
-			return
-		}
-		ctx = ContextWithTenantID(ctx, tenantID)
 
 		// Capture IP and user-agent for audit logging
 		ip := r.Header.Get("X-Forwarded-For")
@@ -73,7 +45,6 @@ func (m *Middleware) RequireAuth(next http.Handler) http.Handler {
 		}
 		ctx = ContextWithRequestInfo(ctx, ip, r.UserAgent())
 
->>>>>>> mai/knuth/p0-audit-trail-append
 		next.ServeHTTP(w, r.WithContext(ctx))
 	})
 }

backend/internal/auth/tenant_resolver.go

@@ -12,12 +12,8 @@ import (
 // Defined as an interface to avoid circular dependency with services.
 type TenantLookup interface {
 	FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error)
-<<<<<<< HEAD
 	VerifyAccess(ctx context.Context, userID, tenantID uuid.UUID) (bool, error)
-||||||| 82878df
-=======
 	GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error)
->>>>>>> mai/pike/p0-role-based
 }
 
 // TenantResolver is middleware that resolves the tenant from X-Tenant-ID header
@@ -46,33 +42,19 @@ func (tr *TenantResolver) Resolve(next http.Handler) http.Handler {
 				http.Error(w, `{"error":"invalid X-Tenant-ID"}`, http.StatusBadRequest)
 				return
 			}
-<<<<<<< HEAD
 
-			// Verify user has access to this tenant
-			hasAccess, err := tr.lookup.VerifyAccess(r.Context(), userID, parsed)
+			// Verify user has access and get their role
+			role, err := tr.lookup.GetUserRole(r.Context(), userID, parsed)
 			if err != nil {
 				slog.Error("tenant access check failed", "error", err, "user_id", userID, "tenant_id", parsed)
 				http.Error(w, `{"error":"internal error"}`, http.StatusInternalServerError)
 				return
 			}
-			if !hasAccess {
+			if role == "" {
 				http.Error(w, `{"error":"no access to tenant"}`, http.StatusForbidden)
 				return
 			}
 
-||||||| 82878df
-=======
-			// Verify user has access and get their role
-			role, err := tr.lookup.GetUserRole(r.Context(), userID, parsed)
-			if err != nil {
-				http.Error(w, "error checking tenant access", http.StatusInternalServerError)
-				return
-			}
-			if role == "" {
-				http.Error(w, "no access to this tenant", http.StatusForbidden)
-				return
-			}
->>>>>>> mai/pike/p0-role-based
 			tenantID = parsed
 			// Override the role from middleware with the correct one for this tenant
 			r = r.WithContext(ContextWithUserRole(r.Context(), role))

backend/internal/auth/tenant_resolver_test.go

@@ -10,49 +10,34 @@ import (
 )
 
 type mockTenantLookup struct {
-<<<<<<< HEAD
 	tenantID  *uuid.UUID
 	err       error
 	hasAccess bool
 	accessErr error
-||||||| 82878df
-	tenantID *uuid.UUID
-	err      error
-=======
-	tenantID *uuid.UUID
-	role     string
-	err      error
->>>>>>> mai/pike/p0-role-based
+	role      string
 }
 
 func (m *mockTenantLookup) FirstTenantForUser(ctx context.Context, userID uuid.UUID) (*uuid.UUID, error) {
 	return m.tenantID, m.err
 }
 
-<<<<<<< HEAD
 func (m *mockTenantLookup) VerifyAccess(ctx context.Context, userID, tenantID uuid.UUID) (bool, error) {
 	return m.hasAccess, m.accessErr
 }
 
-||||||| 82878df
-=======
 func (m *mockTenantLookup) GetUserRole(ctx context.Context, userID, tenantID uuid.UUID) (string, error) {
 	if m.role != "" {
 		return m.role, m.err
 	}
-	return "associate", m.err
+	if m.hasAccess {
+		return "associate", m.err
+	}
+	return "", m.err
 }
 
->>>>>>> mai/pike/p0-role-based
 func TestTenantResolver_FromHeader(t *testing.T) {
 	tenantID := uuid.New()
-<<<<<<< HEAD
-	tr := NewTenantResolver(&mockTenantLookup{hasAccess: true})
-||||||| 82878df
-	tr := NewTenantResolver(&mockTenantLookup{})
-=======
-	tr := NewTenantResolver(&mockTenantLookup{role: "partner"})
->>>>>>> mai/pike/p0-role-based
+	tr := NewTenantResolver(&mockTenantLookup{hasAccess: true, role: "partner"})
 
 	var gotTenantID uuid.UUID
 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {