[ADD] product_origin_char: Free text origin field per supplier

New addon to replace structured country/state fields with flexible
free-text origin descriptions.

Features:
- Translatable origin_text field in product.supplierinfo
- Computed origin field in products based on main_seller_id
- Support for creative supplier origin descriptions
- Full OCA documentation structure
- ES/EU translations included
- 8 unit tests (all passing)

Replaces product_origin for use cases where suppliers use non-standardized
origin descriptions (e.g., 'Valencia, Spain', 'Huerta de...', etc.)

Depends on: product, product_main_seller
Author: Criptomart
Funding: Elika Bilbo

product_origin_char/__manifest__.py

@@ -0,0 +1,21 @@
+# Copyright 2026 Criptomart
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{  # noqa: B018
+    "name": "Product Origin Text",
+    "version": "18.0.1.0.0",
+    "category": "Product",
+    "summary": "Free text origin field per supplier",
+    "author": "Odoo Community Association (OCA), Criptomart",
+    "maintainers": ["Criptomart"],
+    "license": "AGPL-3",
+    "website": "https://git.criptomart.net/criptomart/addons-cm",
+    "depends": [
+        "product",
+        "product_main_seller",
+    ],
+    "data": [
+        "views/product_supplierinfo_views.xml",
+        "views/product_template_views.xml",
+    ],
+}