feat(pos): integrate design system for facturacion, contabilidad, dashboard, config, reportes

Replace 5 POS templates with updated design system pages using tokens.css.
Add routes for dashboard, config, and reports pages.
Create stub JS files for dashboard, config, and reports modules.

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

pos/app.py

@@ -66,6 +66,18 @@ def create_app():
     def pos_accounting():
         return render_template('accounting.html')
 
+    @app.route('/pos/dashboard')
+    def pos_dashboard():
+        return render_template('dashboard.html')
+
+    @app.route('/pos/config')
+    def pos_config():
+        return render_template('config.html')
+
+    @app.route('/pos/reports')
+    def pos_reports():
+        return render_template('reports.html')
+
     @app.route('/pos/static/<path:filename>')
     def pos_static(filename):
         return send_from_directory('static', filename)