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/mock_server/mock_server.js

@@ -0,0 +1,12 @@
+import { onRpc } from "@web/../tests/web_test_helpers";
+
+onRpc("get_avatar_card_data", function getAvatarCardData({ args }) {
+    const resourceId = args[0][0];
+    const resources = this.env["hr.employee.public"].search_read([["id", "=", resourceId]]);
+    return resources.map((resource) => ({
+        name: resource.name,
+        work_email: resource.work_email,
+        phone: resource.phone,
+        user_id: resource.user_id,
+    }));
+});