refactor(api): Rename `continuation_node_id` to `next_node_id`

in `WorkflowSuspension`.

This aligns with the naming convension of the codebase.

api/core/workflow/entities/workflow_suspension.py

@@ -19,7 +19,7 @@ class WorkflowSuspension(BaseModel):
 
     workflow_id: str
 
-    continuation_node_id: str
+    next_node_id: str
 
     state: str
 

api/migrations/versions/2025_07_17_2020-1091956b9ee0_add_workflowsuspension_model_add_.py

@@ -28,7 +28,7 @@ def upgrade():
         sa.Column('workflow_id', models.types.StringUUID(), nullable=False),
         sa.Column('workflow_run_id', models.types.StringUUID(), nullable=False),
         sa.Column('resumed_at', sa.DateTime(), nullable=True),
-        sa.Column('continuation_node_id', sa.String(length=255), nullable=False),
+        sa.Column('next_node_id', sa.String(length=255), nullable=False),
         sa.Column('state_version', sa.String(length=20),  nullable=False),
         sa.Column('state', sa.Text(), nullable=False),
         sa.Column('inputs', sa.Text(), nullable=True),

api/models/workflow.py

@@ -1340,12 +1340,12 @@ class WorkflowSuspension(Base):
         default=sa.null,
     )
 
-    # `continuation_node_id` specifies the next node to execute when the workflow resumes.
+    # `next_node_id` specifies the next node to execute when the workflow resumes.
     #
     # Although this information is embedded within the `state` field, it is extracted
     # into a separate field to facilitate debugging and data analysis.
-    continuation_node_id: Mapped[str] = mapped_column(
+    next_node_id: Mapped[str] = mapped_column(
-        sa.String(length=255),
+        __name_pos=sa.String(length=255),
         nullable=False,
     )