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/img/barcode.svg

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg width="400" height="300" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg">
+    <metadata id="metadata27">image/svg+xml</metadata>
+    <g class="layer">
+        <title>Layer 1</title>
+        <g id="g20">
+            <g id="g12">
+                <rect height="186" id="rect2" width="44" x="61" y="57"/>
+                <rect height="186" id="rect4" width="44" x="236.5" y="57"/>
+                <rect height="186" id="rect6" width="44" x="295" y="57"/>
+                <rect height="186" id="rect8" width="24" x="129.5" y="57"/>
+                <rect height="186" id="rect10" width="14" x="193" y="57"/>
+            </g>
+            <g id="g18">
+                <polygon id="polygon14" points="59.5,269.5 25.5,269.5 25.5,30.5 59.5,30.5 59.5,19.5 14.5,19.5 14.5,280.5 59.5,280.5 "/>
+                <polygon id="polygon16" points="339.4999694824219,19.5 339.4999694824219,30.5 374.4999694824219,30.5 374.4999694824219,269.5 339.4999694824219,269.5 339.4999694824219,280.5 385.4999694824219,280.5 385.4999694824219,19.5 "/>
+            </g>
+        </g>
+    </g>
+</svg>