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/static/src/scss/fp_part_process_composer.scss

@@ -0,0 +1,84 @@
+// Copyright 2026 Nexa Systems Inc.
+// License OPL-1 (Odoo Proprietary License v1.0)
+// Part of the Fusion Plating product family.
+//
+// Sub 3 — Process Composer styles.
+
+.o_fp_part_composer {
+    padding: 16px;
+    max-width: 900px;
+    margin: 0 auto;
+
+    &_state {
+        padding: 32px;
+        text-align: center;
+        color: var(--bs-secondary-color, #666);
+
+        .fa {
+            margin-right: 8px;
+        }
+    }
+
+    &_error {
+        color: var(--bs-danger, #c00);
+    }
+
+    &_header {
+        display: flex;
+        align-items: center;
+        gap: 16px;
+        margin-bottom: 24px;
+        padding-bottom: 16px;
+        border-bottom: 1px solid var(--bs-border-color, #e0e0e0);
+    }
+
+    &_title {
+        h2 {
+            margin: 0;
+            font-size: 20px;
+        }
+    }
+
+    &_loader {
+        display: flex;
+        align-items: center;
+        gap: 12px;
+        margin-bottom: 24px;
+        padding: 16px;
+        background: var(--bs-tertiary-bg, #f5f5f5);
+        border-radius: 8px;
+
+        label {
+            margin: 0;
+            font-weight: 600;
+        }
+
+        select {
+            flex: 1;
+            max-width: 400px;
+        }
+    }
+
+    &_tree {
+        min-height: 300px;
+        padding: 24px;
+        background: var(--bs-body-bg, #ffffff);
+        border-radius: 8px;
+        border: 1px solid var(--bs-border-color, #d8dadd);
+    }
+
+    &_hint,
+    &_empty {
+        text-align: center;
+        padding: 48px 16px;
+
+        .fa {
+            color: var(--bs-secondary-color, #999);
+            margin-bottom: 16px;
+        }
+
+        p {
+            color: var(--bs-secondary-color, #666);
+        }
+    }
+}