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>

backend-compliance/compliance/api/agent_compliance_check_routes.py

@@ -174,9 +174,14 @@ async def _run_compliance_check(check_id: str, req: ComplianceCheckRequest):
                 "word_count": len(text.split()) if text else 0,
             })
 
-        # Step 1b: If same URL used for multiple doc_types, try section splitting
-        from compliance.services.section_splitter import split_shared_texts
+        # Step 1b: Section splitting — two cases:
+        # 1. Same URL used for multiple doc_types → split by heading
+        # 2. DSI text contains Cookie/Social-Media sections → auto-fill empty rows
+        from compliance.services.section_splitter import (
+            split_shared_texts, auto_fill_from_dsi,
+        )
         split_shared_texts(doc_entries, url_text_cache)
+        auto_fill_from_dsi(doc_entries)
         # Refresh doc_texts after splitting
         for entry in doc_entries:
             if entry.get("text"):