feat(fc3c): expose download_rate_limit_seconds + download_validate_files in /api/settings/import

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/api/settings.py

@@ -20,6 +20,8 @@ _EDITABLE_FIELDS = (
     "single_color_threshold",
     "single_color_tolerance",
     "phash_threshold",
+    "download_rate_limit_seconds",
+    "download_validate_files",
 )
 
 
@@ -38,6 +40,8 @@ async def get_import_settings():
         "single_color_threshold": row.single_color_threshold,
         "single_color_tolerance": row.single_color_tolerance,
         "phash_threshold": row.phash_threshold,
+        "download_rate_limit_seconds": row.download_rate_limit_seconds,
+        "download_validate_files": row.download_validate_files,
     })
 
 
@@ -56,6 +60,19 @@ async def update_import_settings():
             {"error": "phash_threshold must be a non-negative integer"}
         ), 400
 
+    if "download_rate_limit_seconds" in body:
+        val = body["download_rate_limit_seconds"]
+        if not isinstance(val, (int, float)) or isinstance(val, bool) or val < 0:
+            return jsonify(
+                {"error": "download_rate_limit_seconds must be a non-negative number"}
+            ), 400
+    if "download_validate_files" in body and not isinstance(
+        body["download_validate_files"], bool
+    ):
+        return jsonify(
+            {"error": "download_validate_files must be a boolean"}
+        ), 400
+
     async with get_session() as session:
         row = (
             await session.execute(select(ImportSettings).where(ImportSettings.id == 1))