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/fleet/static/src/scss/fleet_form.scss

@@ -0,0 +1,21 @@
+.o_fleet_form_view .o_form_renderer {
+
+    .oe_stat_button.text-warning,
+    .oe_stat_button.text-danger {
+        .o_stat_text {
+            color: $o-main-text-color;
+        }
+    }
+}
+
+.o_fleet_narrow_field {
+    max-width: 14rem;
+
+    .o_fleet_odometer_value {
+        max-width: 6rem;
+    }
+
+    .o_fleet_odometer_unit {
+        max-width: 3rem;
+    }
+}