Fix time format: clean spaces before truncating to avoid cutting seconds

Previous order: [:19] then replace(": ", ":") would truncate "06: 59: 28"
to "06: 59: " before cleaning, losing the seconds entirely.
Correct order: clean spaces first, then [:19].

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

app/services/json_generator.py

@@ -22,9 +22,9 @@ def _fmt_datetime(val) -> str:
         return ""
     if hasattr(val, "strftime"):
         return val.strftime("%d/%m/%Y %H:%M:%S")
-    # Eliminar espacios dentro de la parte de hora ("06: 08: 29" → "06:08:29")
-    s = str(val)[:19].replace("T", " ")
-    s = s.replace(": ", ":").replace(" :", ":")
+    # Eliminar espacios dentro de la hora ANTES de truncar ("06: 59: 28" → "06:59:28")
+    s = str(val).replace(": ", ":").replace(" :", ":")
+    s = s[:19].replace("T", " ")
     parts = s.split(" ")
     if len(parts) == 2:
         dp = parts[0].split("-")