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/stock_traceability_report_backend.test.js

@@ -0,0 +1,24 @@
+import { defineMailModels } from "@mail/../tests/mail_test_helpers";
+import { expect, test } from "@odoo/hoot";
+import { defineActions, getService, mountWithCleanup, onRpc } from "@web/../tests/web_test_helpers";
+import { WebClient } from "@web/webclient/webclient";
+
+defineActions([
+    {
+        id: 42,
+        name: "Stock report",
+        tag: "stock_report_generic",
+        type: "ir.actions.client",
+        context: {},
+        params: {},
+    },
+]);
+defineMailModels();
+
+test("Rendering with no lines", async function () {
+    onRpc("get_main_lines", () => []);
+    await mountWithCleanup(WebClient);
+
+    await getService("action").doAction(42);
+    expect(".o_stock_reports_page").toHaveText("No operation made on this lot.");
+});