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/web/static/lib/odoo_ui_icons/Read Me.txt

@@ -0,0 +1,9 @@
+Odoo UI Icons - v1.2
+
+Credits
+- https://www.carbondesignsystem.com/guidelines/icons/library/
+- https://github.com/carbon-design-system/carbon-icons
+- https://github.com/google/material-design-icons
+
+
+Created by SRI using IconMoon (https://icomoon.io/)