feat(qlik): extract network data via Playwright (in-page ws)

The Qlik proxy refuses a raw server-side websocket (403, even internally), so
extraction now runs through headless Chromium (NTLM via httpCredentials, like
the hermes agent) and opens the Engine websocket in-page — same origin, which
the proxy accepts. Efficient: selects the supplier's article codes on the
"Article Code" field so the hypercube returns only those rows.

- qlik-playwright.ts: browser singleton, in-page hypercube extraction (paginated)
- /api/qlik/sync: use the Playwright extractor
- Dockerfile: install chromium + headless deps, PLAYWRIGHT_CHROMIUM_PATH, copy playwright-core
- deps: playwright-core (lockfiles synced)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

next.config.ts

@@ -1,7 +1,7 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   output: "standalone",
-  serverExternalPackages: ["pg", "ws", "httpntlm"],
+  serverExternalPackages: ["pg", "ws", "httpntlm", "playwright-core"],
   experimental: {
     serverActions: {
       bodySizeLimit: "50mb",