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/base/static/description/board.svg

@@ -0,0 +1 @@
+<svg width="50" height="50" viewBox="0 0 50 50" xmlns="http://www.w3.org/2000/svg"><path d="M4 8a4 4 0 0 1 4-4h17v17a4 4 0 0 1-4 4H4V8Z" fill="#FC868B"/><path d="M4 35a4 4 0 0 1 4-4h11v11a4 4 0 0 1-4 4H4V35Z" fill="#F9464C"/><path d="M25 46h4a4 4 0 0 0 4-4V31h-4a4 4 0 0 0-4 4v11Z" fill="#FBB945"/><path d="M31 17v4a4 4 0 0 0 4 4h11v-4a4 4 0 0 0-4-4H31Z" fill="#088BF5"/><path d="M31 4v4a4 4 0 0 0 4 4h11V8a4 4 0 0 0-4-4H31Z" fill="#2EBCFA"/><path d="M38 46h4a4 4 0 0 0 4-4V31h-4a4 4 0 0 0-4 4v11Z" fill="#F78613"/></svg>