Fix tipoDocumento PE/PT: map to single char 'E' for TNS API compatibility

TNS API (C#) expects System.Char for tipoDocumento; "PE" and "PT" caused
400 validation errors. Mapped both to "E" (Cédula Extranjería).

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

app/services/json_generator.py

@@ -59,7 +59,7 @@ def _fmt_datetime(val) -> str:
 _TIPO_DOC_MAP = {
     "CC": "C", "TI": "T", "RC": "R", "CE": "E",
     "PA": "P", "AS": "A", "MS": "M", "NU": "U",
-    "SC": "S", "PE": "PE", "PT": "PT", "SI": "A",
+    "SC": "S", "PE": "E",  "PT": "E",  "SI": "A",
     "CN": "C", "DE": "E", "CD": "P",
 }