feat(configurator): Sub 3 Phase B — part-scoped Process Composer client action + part form Compose button

- Add fp_part_composer_controller with 3 JSON-RPC endpoints:
  /fp/part/composer/state, /fp/part/composer/templates,
  /fp/part/composer/load_template (deep-clones a shared template
  into a part-owned tree inside a cr.savepoint, sets
  fp.part.catalog.default_process_id atomically)
- _clone_subtree copies name/sequence/opt_in_out/treatment_uom plus
  description/notes/icon/color/timing/behaviour/work_center/process_type
  and stamps part_catalog_id + cloned_from_id on every node
- Add fp_part_process_composer OWL client action (JS + XML + SCSS):
  picks template from dropdown, clones, hands off to existing
  fp_recipe_tree_editor via context={recipe_id, part_id}
- Add Process tab on part form with readonly default_process_id
  field and Compose button calling action_open_part_composer
- Register new assets in web.assets_backend, bump configurator
  version to 19.0.11.0.0

fusion_plating/fusion_plating_configurator/views/fp_part_catalog_views.xml

@@ -144,6 +144,24 @@
                         </div>
                     </group>
                     <notebook>
+                        <page string="Process" name="process">
+                            <group>
+                                <field name="default_process_id" readonly="1"
+                                       help="Use the Compose button to set up this part's process tree."/>
+                            </group>
+                            <div class="mt-2">
+                                <button name="action_open_part_composer" type="object"
+                                        string="Compose"
+                                        icon="fa-wrench"
+                                        class="btn-primary"
+                                        help="Open the Process Composer to load a template and edit this part's tree."/>
+                            </div>
+                            <p class="text-muted mt-3">
+                                The <strong>Compose</strong> button opens the Process Composer where you can
+                                load a shared template and customise it for this part. When a job runs for
+                                this part, work orders are generated from the composed tree.
+                            </p>
+                        </page>
                         <page string="Dimensions &amp; Complexity" name="dimensions">
                             <group>
                                 <group>