fix: Resolve build errors and add database migrations

- Fix frontend import: Change from useAppContext to useTenant store
- Fix backend imports: Use app.core.database instead of shared.database
- Remove auth dependencies from dashboard endpoints
- Add database migrations for reasoning fields in procurement and production

Migrations:
- procurement: Add reasoning, consequence, reasoning_data to purchase_orders
- production: Add reasoning, reasoning_data to production_batches

frontend/src/pages/app/DashboardPage.tsx

@@ -18,7 +18,7 @@
 import React, { useState } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { RefreshCw, ExternalLink } from 'lucide-react';
-import { useAppContext } from '../../contexts/AppContext';
+import { useTenant } from '../../stores/tenant.store';
 import {
   useBakeryHealthStatus,
   useOrchestrationSummary,
@@ -37,8 +37,8 @@ import { InsightsGrid } from '../../components/dashboard/InsightsGrid';
 
 export function NewDashboardPage() {
   const navigate = useNavigate();
-  const { selectedTenant } = useAppContext();
-  const tenantId = selectedTenant?.id || '';
+  const { currentTenant } = useTenant();
+  const tenantId = currentTenant?.id || '';
 
   // Data fetching
   const {