feat(nlp-service): full extract() pipeline — assembles all steps

Also adds regex year-fallback in extract_dates() for de/es spaCy small
models that don't tag bare 4-digit years as DATE entities, and widens
the direction-token window to 2 tokens back to handle Spanish "antes de".

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nlp-service/test_extractor.py

@@ -298,3 +298,53 @@ def test_keywords_deduplicates(nlp_de):
     doc = nlp_de("Brief Brief Krieg", disable=["ner"])
     keywords = extract_keywords(doc, [])
     assert keywords.count("brief") == 1
+
+
+# ── Full extract() pipeline ──────────────────────────────────────────────────
+
+def test_extract_dates_de():
+    from extractor import extract
+    result = extract("Briefe vor 1920", "de")
+    assert result.dateFrom is None
+    assert result.dateTo == "1920-12-31"
+    assert result.rawQuery == "Briefe vor 1920"
+    assert result.personNames == []
+    assert result.personRole == "any"
+
+
+def test_extract_keywords_from_topic_de():
+    from extractor import extract
+    result = extract("Briefe aus dem Krieg", "de")
+    assert "krieg" in result.keywords
+    assert result.dateFrom is None
+    assert result.dateTo is None
+
+
+def test_extract_dates_en():
+    from extractor import extract
+    result = extract("letters before 1920", "en")
+    assert result.dateTo == "1920-12-31"
+    assert result.dateFrom is None
+
+
+def test_extract_dates_es():
+    from extractor import extract
+    result = extract("cartas antes de 1920", "es")
+    assert result.dateTo == "1920-12-31"
+    assert result.dateFrom is None
+
+
+def test_extract_rawquery_echoed():
+    from extractor import extract
+    q = "Texte über Weihnachten"
+    result = extract(q, "de")
+    assert result.rawQuery == q
+
+
+def test_extract_response_fields_are_complete():
+    from extractor import extract
+    result = extract("Briefe 1900", "de")
+    assert isinstance(result.personNames, list)
+    assert result.personRole in ("sender", "receiver", "any")
+    assert isinstance(result.keywords, list)
+    assert result.rawQuery == "Briefe 1900"