[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/pyproject.toml

@@ -0,0 +1,26 @@
+[tool.black]
+line-length = 88
+target-version = ['py310']
+include = '\.pyi?$'
+exclude = '''
+/(
+    \.git
+  | \.hg
+  | \.mypy_cache
+  | \.tox
+  | \.venv
+  | _build
+  | buck-out
+  | build
+  | dist
+  | __pycache__
+)/
+'''
+
+[tool.isort]
+profile = "black"
+line_length = 88
+known_odoo = "odoo"
+known_odoo_addons = "odoo.addons"
+sections = ["FUTURE", "STDLIB", "THIRDPARTY", "ODOO", "ODOO_ADDONS", "FIRSTPARTY", "LOCALFOLDER"]
+default_section = "THIRDPARTY"