feat(nlp-service): wire NLP_FUZZY_THRESHOLD env var with 0-100 validation

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

nlp-service/test_main.py

@@ -81,6 +81,23 @@ def test_parse_all_languages(client):
         assert r.json()["dateTo"] == "1920-12-31", f"Wrong dateTo for lang={lang}"
 
 
+def test_fuzzy_threshold_valid_range():
+    from main import _parse_fuzzy_threshold
+    assert _parse_fuzzy_threshold("80") == 80
+    assert _parse_fuzzy_threshold("0") == 0
+    assert _parse_fuzzy_threshold("100") == 100
+
+
+def test_fuzzy_threshold_out_of_range_raises():
+    from main import _parse_fuzzy_threshold
+    with pytest.raises(ValueError):
+        _parse_fuzzy_threshold("101")
+    with pytest.raises(ValueError):
+        _parse_fuzzy_threshold("-1")
+    with pytest.raises(ValueError):
+        _parse_fuzzy_threshold("abc")
+
+
 def test_parse_exceeds_max_length_returns_422(client):
     r = client.post("/parse", json={"query": "a" * 501, "lang": "de"})
     assert r.status_code == 422