Fix CSS loading: copy odoo_web.css to frontend, handle /odoo/ static paths

- Copy build/odoo_web.css to frontend/web/static/ so it's served correctly
- Handle /odoo/<addon>/static/ paths in static file handler (strip odoo/ prefix)
- Route /odoo/ paths with /static/ to static handler instead of webclient

All CSS now loads correctly: Bootstrap, FontAwesome, Odoo UI icons, modules.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pkg/server/server.go

@@ -66,7 +66,14 @@ func (s *Server) registerRoutes() {
 	s.mux.HandleFunc("/web", s.handleWebClient)
 	s.mux.HandleFunc("/web/", s.handleWebRoute)
 	s.mux.HandleFunc("/odoo", s.handleWebClient)
-	s.mux.HandleFunc("/odoo/", s.handleWebClient)
+	s.mux.HandleFunc("/odoo/", func(w http.ResponseWriter, r *http.Request) {
+		// /odoo/base/static/... → serve static files
+		if strings.Contains(r.URL.Path, "/static/") {
+			s.handleStatic(w, r)
+			return
+		}
+		s.handleWebClient(w, r)
+	})
 
 	// Login page
 	s.mux.HandleFunc("/web/login", s.handleLogin)