feat: working Puppeteer scraper for Promofarma

- Added Puppeteer with Chrome in Docker
- Scraper extracts products using data attributes
- Added /api/scrape endpoint
- Tested: 10 products scraped from Promofarma

The scraper now works with Promofarma's HTML structure which uses
data-name, data-pvp attributes on article elements.

n8n/workflow-sdk.js

@@ -0,0 +1,145 @@
+import { workflow, node, trigger } from '@n8n/workflow-sdk';
+
+const webhook = trigger({
+  type: 'n8n-nodes-base.webhook',
+  version: 2,
+  config: {
+    name: 'Webhook',
+    position: [240, 300],
+    parameters: {
+      httpMethod: 'POST',
+      path: 'scrape-fixed',
+      responseMode: 'lastNode'
+    }
+  },
+  output: [{}]
+});
+
+const parseInput = node({
+  type: 'n8n-nodes-base.code',
+  version: 2,
+  config: {
+    name: 'Parse Input',
+    position: [440, 300],
+    parameters: {
+      jsCode: `const body = $input.first().json.body || {};
+return [{ json: { queries: body.queries || 'crema hidratante', sources: body.sources || ['promofarma'] } }];`
+    }
+  },
+  output: [{}]
+});
+
+const generateTasks = node({
+  type: 'n8n-nodes-base.code',
+  version: 2,
+  config: {
+    name: 'Generate Tasks',
+    position: [640, 300],
+    parameters: {
+      jsCode: `const input = $input.first().json;
+const queries = input.queries.split(',').map(q => q.trim());
+const tasks = [];
+for (const q of queries) {
+  tasks.push({ query: q, source: 'promofarma', url: 'https://www.promofarma.com/es/search?q=' + encodeURIComponent(q) });
+}
+return tasks.map(t => ({ json: t }));`
+    }
+  },
+  output: [{}]
+});
+
+const scrape = node({
+  type: 'n8n-nodes-base.httpRequest',
+  version: 4.2,
+  config: {
+    name: 'Scrape',
+    position: [840, 300],
+    parameters: {
+      method: 'GET',
+      url: '={{ $json.url }}',
+      options: { timeout: 30000 }
+    }
+  },
+  output: [{}]
+});
+
+const extractProducts = node({
+  type: 'n8n-nodes-base.code',
+  version: 2,
+  config: {
+    name: 'Extract Products',
+    position: [1040, 300],
+    parameters: {
+      jsCode: `const data = $input.first().json;
+const html = data.data || '';
+const source = data.source;
+const products = [];
+const cardRegex = /<(?:div|article)[^>]*class="[^"]*product[^"]*"[^>]*>([\\s\\S]*?)<\\/(?:div|article)>/gi;
+const nameRegex = /<h[23][^>]*>([^<]+)<\\/h[23]>/i;
+const priceRegex = /class="[^"]*price[^"]*"[^>]*>([^<]*\\d+[.,]\\d+[^<]*)<\\/[^>]+>/i;
+let match;
+while ((match = cardRegex.exec(html)) !== null) {
+  const card = match[1];
+  const name = nameRegex.exec(card)?.[1]?.trim();
+  const priceStr = priceRegex.exec(card)?.[1]?.trim();
+  if (name && name.length > 3) {
+    const price = parseFloat(priceStr?.replace(/[^\\d.,]/g, '').replace(',', '.')) || 0;
+    if (price > 0 && price < 1000) {
+      products.push({
+        name: name.substring(0, 200),
+        price,
+        source,
+        source_product_id: source + '_' + Date.now() + '_' + Math.random().toString(36).substr(2, 6),
+        source_url: 'https://www.' + source + '.com',
+        brand: '',
+        category: 'parapharmacy',
+        available: true,
+        scraped_at: new Date().toISOString()
+      });
+    }
+  }
+}
+return products.slice(0, 5).map(p => ({ json: p }));`
+    }
+  },
+  output: [{}]
+});
+
+const sendToApi = node({
+  type: 'n8n-nodes-base.httpRequest',
+  version: 4.2,
+  config: {
+    name: 'Send to API',
+    position: [1240, 300],
+    parameters: {
+      method: 'POST',
+      url: 'http://parapharmacy-api:3002/api/products/bulk',
+      sendBody: true,
+      specifyBody: 'json',
+      jsonBody: '={{ JSON.stringify({ products: $input.all().map(i => i.json) }) }}'
+    }
+  },
+  output: [{}]
+});
+
+const response = node({
+  type: 'n8n-nodes-base.code',
+  version: 2,
+  config: {
+    name: 'Response',
+    position: [1440, 300],
+    parameters: {
+      jsCode: `return [{ json: { success: true, message: 'Scraping completed', products: $input.all().length } }];`
+    }
+  },
+  output: [{}]
+});
+
+export default workflow('scrape-fixed', 'Parapharmacy Scraper Fixed')
+  .add(webhook)
+  .to(parseInput)
+  .to(generateTasks)
+  .to(scrape)
+  .to(extractProducts)
+  .to(sendToApi)
+  .to(response);