Fix: units table uses status='active' not is_active column

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

backend/src/modules/investment-planning/investment-planning.service.ts

@@ -268,7 +268,7 @@ export class InvestmentPlanningService {
     // Assessment income (monthly recurring revenue)
     const assessmentIncome = await this.tenant.query(`
       SELECT
-        COALESCE(SUM(ag.regular_assessment * (SELECT COUNT(*) FROM units u WHERE u.assessment_group_id = ag.id AND u.is_active = true)), 0) as monthly_assessment_income
+        COALESCE(SUM(ag.regular_assessment * (SELECT COUNT(*) FROM units u WHERE u.assessment_group_id = ag.id AND u.status = 'active')), 0) as monthly_assessment_income
       FROM assessment_groups ag
       WHERE ag.is_active = true
     `);