Redesign configurator UI with tabs and remove Excel export

- Add tab-based configurator (Base, Storage, PCI, Power, Accessories, Other)
- Base tab: single-select with autocomplete for MB, CPU, MEM
- Other tabs: multi-select with autocomplete and quantity input
- Table view with LOT, Description, Price, Quantity, Total columns
- Add configuration list page with create modal (opportunity number)
- Remove Excel export functionality and excelize dependency
- Increase component list limit from 100 to 5000
- Add web templates (base, index, configs, login, admin_pricing)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

web/static/app.css

@@ -0,0 +1,9 @@
+/* QuoteForge custom styles */
+/* Tailwind is loaded via CDN, this file is for any custom overrides */
+
+.line-clamp-2 {
+    display: -webkit-box;
+    -webkit-line-clamp: 2;
+    -webkit-box-orient: vertical;
+    overflow: hidden;
+}