Eliminate Python dependency: embed frontend assets in odoo-go

- Copy all OWL frontend assets (JS/CSS/XML/fonts/images) into frontend/
  directory (2925 files, 43MB) — no more runtime reads from Python Odoo
- Replace OdooAddonsPath config with FrontendDir pointing to local frontend/
- Rewire bundle.go, static.go, templates.go, webclient.go to read from
  frontend/ instead of external Python Odoo addons directory
- Auto-detect frontend/ and build/ dirs relative to binary in main.go
- Delete obsolete Python helper scripts (tools/*.py)

The Go server is now fully self-contained: single binary + frontend/ folder.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/stock/static/tests/counted_quantity_widget.test.js

@@ -0,0 +1,68 @@
+import { defineMailModels } from "@mail/../tests/mail_test_helpers";
+import { expect, test } from "@odoo/hoot";
+import { contains, defineModels, fields, models, mountView } from "@web/../tests/web_test_helpers";
+
+class Quant extends models.Model {
+    quantity = fields.Float();
+    inventory_quantity = fields.Float({
+        string: "Counted quantity",
+        onChange: (quant) => {
+            quant.inventory_diff_quantity = quant.inventory_quantity - quant.quantity;
+        },
+    });
+    inventory_quantity_set = fields.Boolean({
+        string: "Inventory quantity set",
+    });
+    inventory_diff_quantity = fields.Float({ string: "Difference" });
+
+    _records = [{ id: 1, quantity: 50 }];
+}
+defineModels([Quant]);
+defineMailModels();
+
+test("Test changing the inventory quantity with the widget", async function () {
+    await mountView({
+        type: "list",
+        resModel: "quant",
+        arch: `<list editable="bottom">
+                        <field name="quantity"/>
+                        <field name="inventory_quantity" widget="counted_quantity_widget"/>
+                        <field name="inventory_quantity_set"/>
+                        <field name="inventory_diff_quantity"/>
+                   </list>
+                `,
+    });
+
+    await contains("td.o_counted_quantity_widget_cell").click();
+    await contains("td.o_counted_quantity_widget_cell input").edit("23");
+    await contains("td[name=inventory_diff_quantity]").click();
+
+    expect("td[name=inventory_diff_quantity] div input").toHaveValue(-27);
+    expect("td[name=inventory_quantity_set] div input").toBeChecked();
+
+    await contains("td.o_counted_quantity_widget_cell").click();
+    await contains("td.o_counted_quantity_widget_cell input").edit("40.5");
+    await contains("td[name=inventory_diff_quantity]").click();
+
+    expect("td[name=inventory_diff_quantity] div input").toHaveValue(-9.5);
+});
+
+test("Test setting the inventory quantity to its default value of 0", async function () {
+    await mountView({
+        type: "list",
+        resModel: "quant",
+        arch: `<list editable="bottom">
+                        <field name="quantity"/>
+                        <field name="inventory_quantity" widget="counted_quantity_widget"/>
+                        <field name="inventory_quantity_set"/>
+                        <field name="inventory_diff_quantity"/>
+                   </list>
+                `,
+    });
+
+    await contains("td.o_counted_quantity_widget_cell").click();
+    await contains("td.o_counted_quantity_widget_cell input").edit("0");
+    await contains("td[name=inventory_diff_quantity]").click();
+
+    expect("td[name=inventory_diff_quantity] div input").toHaveValue(-50);
+});