Enhance call flow visualization

[eliweaver732]

What: This PR improves the Call Flow Map visualization by standardizing status labels and adding the dial code (feature code) display for call flows.

Why:

• Consistency: Call flow nodes now display the same status labels ("Active" or "Alternate") that customers see in the FusionPBX call flows list interface. This does also display using the currently active custom label if set.
• Visibility: Adding the dial code allows customers to easily identify how to reach each call flow when they export the diagram to PNG

Changes:

• Updated the call flow node label formatting to show the call_flow_label (for Active status) or call_flow_alternate_label (for Alternate status) instead of a generic "Status" field
• Added display of the call_flow_feature_code (dial code) to nodes so customers can see it in both the interactive diagram and PNG exports
• Applied these changes in both the forward build path and the reverse extension lookup path for consistency