Add fabric-node delete on classify inventory for orphans and placeholders.

Allow removing detached or LLDP/WebCRT fabric rows from classify and slices without touching managed/UME inventory; keep UME-only nodes protected.

Co-authored-by: Cursor <cursoragent@cursor.com>

netx_api/topology_schemas.py

@@ -32,6 +32,7 @@ class FabricNodeOut(BaseModel):
     managed_alive: bool = False
     ume_alive: bool = False
     managed_source: str = ""  # manual | ume_sync | lldp | webcrt | …
+    deletable: bool = False
 
 
 class FabricEdgeOut(BaseModel):
@@ -425,6 +426,16 @@ class FabricNodesBulkTagOut(BaseModel):
     samples: list[dict[str, Any]] = Field(default_factory=list)
 
 
+class FabricNodesDeleteRequest(BaseModel):
+    fabric_node_ids: list[str] = Field(default_factory=list, min_length=1)
+
+
+class FabricNodesDeleteOut(BaseModel):
+    deleted: int = 0
+    edges_deleted: int = 0
+    placements_deleted: int = 0
+
+
 class SliceGenerateRequest(BaseModel):
     folder_id: str
     template: str = Field(description="core_only | core_agg | agg_access")