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/templates/components_list.html

@@ -0,0 +1,52 @@
+{{define "components_list.html"}}
+{{if .Components}}
+<div class="bg-white rounded-lg shadow overflow-hidden">
+    <table class="w-full">
+        <thead class="bg-gray-50">
+            <tr>
+                <th class="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Артикул</th>
+                <th class="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Категория</th>
+                <th class="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Описание</th>
+                <th class="px-4 py-3 text-right text-xs font-medium text-gray-500 uppercase">Цена</th>
+                <th class="px-4 py-3 text-center text-xs font-medium text-gray-500 uppercase w-24"></th>
+            </tr>
+        </thead>
+        <tbody class="divide-y">
+            {{range .Components}}
+            <tr class="hover:bg-gray-50">
+                <td class="px-4 py-3 text-sm font-medium font-mono">{{.LotName}}</td>
+                <td class="px-4 py-3 text-sm">
+                    <span class="px-2 py-1 text-xs rounded bg-gray-100">{{.Category}}</span>
+                </td>
+                <td class="px-4 py-3 text-sm text-gray-500 max-w-md truncate">{{.Description}}</td>
+                <td class="px-4 py-3 text-sm text-right font-medium">
+                    {{if .CurrentPrice}}
+                        ${{printf "%.2f" (deref .CurrentPrice)}}
+                    {{else}}
+                        <span class="text-gray-400">—</span>
+                    {{end}}
+                </td>
+                <td class="px-4 py-3 text-center">
+                    {{if .CurrentPrice}}
+                    <button onclick="addToCart('{{jsesc .LotName}}', {{deref .CurrentPrice}}, '{{jsesc .Description}}')"
+                            class="px-3 py-1 bg-blue-600 text-white text-xs rounded hover:bg-blue-700">
+                        + Добавить
+                    </button>
+                    {{else}}
+                    <span class="text-gray-400 text-xs">Нет цены</span>
+                    {{end}}
+                </td>
+            </tr>
+            {{end}}
+        </tbody>
+    </table>
+</div>
+
+<p class="text-center text-sm text-gray-500 mt-4">Найдено: {{.Total}}</p>
+
+{{else}}
+<div class="bg-white rounded-lg shadow p-8 text-center text-gray-500">
+    Компоненты не найдены
+</div>
+{{end}}
+{{end}}