feat: add core backend modules, inventory services, and patch scripts for AI Pharmacy API

fix_stock_admin.ts

@@ -0,0 +1,20 @@
+import { pool } from './src/db/pool';
+
+async function run() {
+  try {
+    const batchNo = "FIX-act_admin"; 
+    
+    await pool.query(`
+      INSERT INTO batches (batch_no, tenant_id, product_id, expiry, qty_on_hand, purchase_price)
+      VALUES ($1, $2, $3, $4, $5, $6)
+      ON CONFLICT DO NOTHING
+    `, [batchNo, 'act_admin', 'prd_1789110114931', '2028-12-31', 5000, 10.00]);
+    
+    console.log(`Added 5000 stock for act_admin`);
+  } catch (e) {
+    console.error(e);
+  } finally {
+    process.exit();
+  }
+}
+run();