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

fix_stock.ts

@@ -0,0 +1,24 @@
+import { pool } from './src/db/pool';
+
+async function run() {
+  try {
+    const { rows: users } = await pool.query("SELECT id FROM users");
+    
+    for (const user of users) {
+      const batchNo = "FIX-BATCH-" + user.id.substring(4, 10);
+      
+      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, user.id, 'prd_1789110114931', '2028-12-31', 1000, 10.00]);
+      
+      console.log(`Added 1000 stock for user ${user.id}`);
+    }
+  } catch (e) {
+    console.error(e);
+  } finally {
+    process.exit();
+  }
+}
+run();