feat: add Postgres MCP integration for database testing

- Add postgres-mcp service to docker-compose.yml (SSE mode on port 8000)
- Add .mcp.json.example with SSE configuration template
- Add .gitignore entries for .claude/settings.local.json and .mcp.json
- Add MCP_EXAMPLES.md with query examples for testing scraping results
- Add analysis scripts: analyze-category-nulls.ts, check-product-details.ts,
  inspect-api-response.ts

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

src/scripts/check-product-details.ts

@@ -0,0 +1,38 @@
+import 'dotenv/config';
+import { connectDatabase, disconnectDatabase, prisma } from '../config/database.js';
+import { Logger } from '../utils/logger.js';
+
+async function main() {
+  try {
+    await connectDatabase();
+
+    // Get a sample product with all fields
+    const product = await prisma.product.findFirst({
+      select: {
+        id: true,
+        externalId: true,
+        name: true,
+        description: true,
+        currentPrice: true,
+        unit: true,
+        weight: true,
+        brand: true,
+        categoryId: true,
+        badges: true,
+      }
+    });
+
+    if (product) {
+      Logger.info('=== ДЕТАЛИ ТОВАРА ИЗ БД ===');
+      Logger.info(JSON.stringify(product, null, 2));
+    }
+
+  } catch (error) {
+    Logger.error('❌ Ошибка:', error);
+    process.exit(1);
+  } finally {
+    await disconnectDatabase();
+  }
+}
+
+main();