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/hr/static/tests/profile_form_view.test.js

@@ -0,0 +1,41 @@
+import {
+    clickSave,
+    contains,
+    makeMockServer,
+    mockService,
+    mountView,
+} from "@web/../tests/web_test_helpers";
+import { describe, expect, test } from "@odoo/hoot";
+import { defineHrModels } from "@hr/../tests/hr_test_helpers";
+
+describe.current.tags("desktop");
+defineHrModels();
+
+test("editing the 'lang' field and saving it triggers a 'reload_context'", async function () {
+    const { env } = await makeMockServer();
+    const userId = env["fake.user"].create({
+        name: "Aline",
+        lang: "fr",
+    });
+    mockService("action", {
+        doAction(action) {
+            expect.step(action);
+        },
+    });
+    await mountView({
+        type: "form",
+        resModel: "fake.user",
+        arch: `
+            <form js_class="hr_user_preferences_form">
+                <field name="name"/>
+                <field name="lang"/>
+            </form>`,
+        resId: userId,
+    });
+    await contains("[name='name'] input").edit("John");
+    await clickSave();
+    expect.verifySteps([]);
+    await contains("[name='lang'] input").edit("En");
+    await clickSave();
+    expect.verifySteps(["reload_context"]);
+});