refactor(category): retrofit N-01..N-03 category image/pixelpro/* -> ComfyUI-JH-PixelPro/* (Q-NS)

Unify 6-node pack under pack-branded namespace ComfyUI-JH-PixelPro/<group> in
ComfyUI "Add Node" menu. Category UI-only change - existing workflow JSON links
not affected (reference node class name, not category path).

- frequency_node.py: image/pixelpro/filters -> ComfyUI-JH-PixelPro/filters
- mask_refiner_node.py: image/pixelpro/morphology -> ComfyUI-JH-PixelPro/mask
- smoother_node.py: image/pixelpro/filters -> ComfyUI-JH-PixelPro/filters

Q-NS decision Cowork propose 2026-04-19 00:10, JH adopt 00:15.

nodes/frequency_node.py

@@ -10,7 +10,7 @@ from ..core import frequency_separation
 class JHPixelProFrequencySeparation:
     """Split a ComfyUI IMAGE into Gaussian low/high frequency pins."""
 
-    CATEGORY = "image/pixelpro/filters"
+    CATEGORY = "ComfyUI-JH-PixelPro/filters"
     RETURN_TYPES = ("IMAGE", "IMAGE")
     RETURN_NAMES = ("low", "high")
     FUNCTION = "run"

nodes/mask_refiner_node.py

@@ -10,7 +10,7 @@ from ..core import subpixel_mask_refine
 class JHPixelProSubPixelMaskRefiner:
     """Refine a binary-ish ComfyUI MASK into a sub-pixel alpha mask."""
 
-    CATEGORY = "image/pixelpro/morphology"
+    CATEGORY = "ComfyUI-JH-PixelPro/mask"
     RETURN_TYPES = ("MASK",)
     RETURN_NAMES = ("refined_mask",)
     FUNCTION = "run"

nodes/smoother_node.py

@@ -10,7 +10,7 @@ from ..core import edge_aware_smooth
 class JHPixelProEdgeAwareSmoother:
     """Apply edge-preserving bilateral smoothing to a ComfyUI IMAGE, optionally gated by a MASK."""
 
-    CATEGORY = "image/pixelpro/filters"
+    CATEGORY = "ComfyUI-JH-PixelPro/filters"
     RETURN_TYPES = ("IMAGE",)
     RETURN_NAMES = ("image",)
     FUNCTION = "run"