Optimize topology canvas per the 2026-10-12 plan.

Save path: one atomic POST /views/{id}/commit (edges, ports, styles, node
add/remove, positions) replaces the multi-request save. Edge styles and
manual-edge port edits now go through dirty/undo/save instead of writing
immediately; non-manual edge ports are read-only.

Data safety: UI saves no longer clear MCP node locks or freeze the device
name into the placement label (label_override + omit-means-keep semantics,
also applied to the MCP positions tool). Adding NEs/neighbors with unsaved
edits now saves first instead of silently dropping them. Positions no longer
bypass membership caps, except persisting synthesized child-region icons.

Fixes found in acceptance: nodes added in the same commit kept (40,40)
under autoflush=False; edits on edges deleted in the same save 404'd the
whole save; box-selection drags and arrow-key moves were not marked dirty;
large canvases far from the origin opened blank and locate did nothing
because fitView waits for measurement that onlyRenderVisibleElements never
does (now fitBounds from known geometry).

Also: batch N+1 lookups in graph/positions, deterministic truncation,
outside-peer scan excludes internal edges, split TopologyPage into hooks,
fix flaky UME/LLDP port test, add scripts/topology_clear_frozen_labels.py.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

netx_api/topology_service.py

@@ -39,6 +39,7 @@ from .topology_views import (
     _place_fabric_ids_on_view,
     add_nodes_to_view,
     bootstrap_topology_tree,
+    commit_view_changes,
     create_folder,
     create_topology_placeholder_on_view,
     create_view,
@@ -48,6 +49,7 @@ from .topology_views import (
     get_topology_tree,
     get_view_graph,
     list_views,
+    patch_manual_edge_ports,
     patch_view_edge_style,
     patch_view_positions,
     populate_view,
@@ -68,6 +70,7 @@ __all__ = [
     "_place_fabric_ids_on_view",
     "add_nodes_to_view",
     "bootstrap_topology_tree",
+    "commit_view_changes",
     "create_folder",
     "create_topology_placeholder_on_view",
     "create_view",
@@ -88,6 +91,7 @@ __all__ = [
     "list_fabric_nodes",
     "list_views",
     "merge_duplicate_fabric_nodes",
+    "patch_manual_edge_ports",
     "patch_view_edge_style",
     "patch_view_positions",
     "pause_discover_job",