fix: 5 regex bugs + text extraction scroll + GT update

Root cause: Spiegel DSI text was truncated (lazy-loading) — the
rights/DSB/complaints sections at the bottom were never extracted.

Fixes:
1. Text extraction: scroll to bottom before innerText (dsi_discovery.py)
2. V.i.S.d.P.: add "verantwortlicher i.s.v." + "§18 Abs. N MStV" pattern
3. USt-IdNr: add "umsatzsteuer-id" + "DE 212 442 423" (with spaces)
4. Profiler: remove generic "anwalt"/"praxis" (false positive on Spiegel
   "Redaktionsanwalt"), keep only "rechtsanwalt", "kanzlei" etc.
5. Section splitter: auto_fill_from_dsi() fills empty Cookie/Social-Media
   rows from sections found in the DSI text

Ground Truth 06-spiegel.md fully rewritten with verified data from
live website — 3 L1 False Negatives identified (DSB, Beschwerderecht,
Betroffenenrechte all present on website but not in extracted text).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

consent-tester/services/dsi_discovery.py

@@ -263,6 +263,12 @@ async def discover_dsi_documents(
             is_self_dsi, self_lang = _matches_dsi_keyword(page_title)
         if is_self_dsi:
             try:
+                # Scroll to bottom to trigger lazy-loading of full content
+                await page.evaluate("window.scrollTo(0, document.body.scrollHeight)")
+                await page.wait_for_timeout(1500)
+                await page.evaluate("window.scrollTo(0, document.body.scrollHeight)")
+                await page.wait_for_timeout(1000)
+
                 self_text = await page.evaluate("""() => {
                     const main = document.querySelector('main, article, [role="main"], .content, #content, .bodytext')
                         || document.body;