Add get_timestamp() and format_output_filename() utilities to folder_paths.py
that generate unique filenames with UTC timestamps. This eliminates the need
for client-side cache-busting query parameters.
New filename format: prefix_00001_20260131-220945-123456_.ext
Updated all save nodes to use the new format:
- nodes.py (SaveImage, SaveLatent, SaveImageWebsocket)
- comfy_api/latest/_ui.py (UILatent)
- comfy_extras/nodes_video.py (SaveWEBM, SaveAnimatedPNG, SaveAnimatedWEBP)
- comfy_extras/nodes_images.py (SaveSVG)
- comfy_extras/nodes_hunyuan3d.py (Save3D)
- comfy_extras/nodes_model_merging.py (SaveCheckpointSimple)
- comfy_extras/nodes_lora_extract.py (LoraSave)
- comfy_extras/nodes_train.py (SaveEmbedding)
Amp-Thread-ID: https://ampcode.com/threads/T-019c17e5-1c0a-736f-970d-e411aae222fc
