fix(scan): leave the browser-parser NaN parse to the resolver parity fix

The scan fallback's legacy-page parse (parse_page_json in _graph_prompt_text)
is owned by the resolver parity change, which adds the same helper with the
legacy pages' exact rule (NaN reads as null, Infinity still rejected). This
branch keeps only the strict serialization of stored and answered JSON.

py/api/admin.py

@@ -41,7 +41,7 @@ try:
         PLACEHOLDERS,
         GenerationParamsError,
         extract_generation_params,
-        parse_page_json,
+        parse_js_json,
     )
     from ...utils.prompt_pair_resolver import resolve_prompt_pair
 except ImportError:
@@ -51,7 +51,7 @@ except ImportError:
         PLACEHOLDERS,
         GenerationParamsError,
         extract_generation_params,
-        parse_page_json,
+        parse_js_json,
     )
     from utils.prompt_pair_resolver import resolve_prompt_pair
 
@@ -1606,8 +1606,7 @@ class AdminRoutesMixin:
         records = {}
         for key in ("prompt", "workflow"):
             value = metadata.get(key)
-            # As the legacy pages parse it: ComfyUI's NaN/Infinity read as null.
-            records[key] = parse_page_json(value) if isinstance(value, str) else value
+            records[key] = parse_js_json(value) if isinstance(value, str) else value
         try:
             positive = extract_generation_params(records)["positivePrompt"]
         except GenerationParamsError: