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/services/section_splitter.py

@@ -168,3 +168,48 @@ def _find_section_for_type(sections: list[dict], doc_type: str) -> str | None:
             return section["text"]
 
     return None  # No match → keep full text
+
+
+def auto_fill_from_dsi(doc_entries: list[dict]) -> None:
+    """Auto-fill empty document rows from sections found in the DSI text.
+
+    If the user only entered the DSI URL but left Cookie/Social-Media empty,
+    and the DSI text contains those sections, auto-fill them.
+    """
+    # Find the DSI entry
+    dsi_entry = None
+    for entry in doc_entries:
+        if entry["doc_type"] in ("dse", "datenschutz", "privacy") and entry.get("text"):
+            dsi_entry = entry
+            break
+    if not dsi_entry:
+        return
+
+    dsi_text = dsi_entry["text"]
+    if len(dsi_text) < 300:
+        return
+
+    # Split DSI into sections
+    sections = _split_at_headings(dsi_text)
+    if not sections:
+        return
+
+    # Find empty entries that could be filled from DSI sections
+    filled = []
+    for entry in doc_entries:
+        if entry.get("text") or entry.get("url"):
+            continue  # Already has content
+
+        doc_type = entry["doc_type"]
+        section_text = _find_section_for_type(sections, doc_type)
+        if section_text and len(section_text.split()) >= 30:
+            entry["text"] = section_text
+            entry["word_count"] = len(section_text.split())
+            entry["url"] = f"{dsi_entry.get('url', '')} (Abschnitt)"
+            filled.append(doc_type)
+
+    if filled:
+        logger.info(
+            "Auto-filled %d empty rows from DSI sections: %s",
+            len(filled), ", ".join(filled),
+        )