Skip bypassed nodes (mode 4) in workflow conversion

Bypassed/muted nodes should not be included in the API workflow,
and connections from bypassed nodes should be ignored.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

handler.py

@@ -116,11 +116,16 @@ def convert_frontend_to_api(frontend_workflow: dict) -> dict:
     nodes = frontend_workflow.get("nodes", [])
     links = frontend_workflow.get("links", [])
 
+    # Build set of active (non-bypassed) node IDs
+    active_nodes = {str(node["id"]) for node in nodes if node.get("mode") != 4}
+
     # Build link lookup: link_id -> (source_node_id, source_slot)
+    # Only include links from active nodes
     link_map = {}
     for link in links:
         link_id, src_node, src_slot, dst_node, dst_slot, link_type = link[:6]
-        link_map[link_id] = (str(src_node), src_slot)
+        if str(src_node) in active_nodes:
+            link_map[link_id] = (str(src_node), src_slot)
 
     # Widget mappings for each node type: list of input names in order
     WIDGET_MAPPINGS = {
@@ -165,6 +170,10 @@ def convert_frontend_to_api(frontend_workflow: dict) -> dict:
     }
 
     for node in nodes:
+        # Skip bypassed/muted nodes (mode 4)
+        if node.get("mode") == 4:
+            continue
+
         node_id = str(node["id"])
         class_type = node.get("type", "")