feat(index): add homepage with dashboard cards and knowledge graph support

- Add new Index view with dashboard layout and quick action cards
- Create TopCardList component to display core data management options
- Add GuideCard and VersionCard components for user guidance
- Add QuickActions component for common operations
- Create KnowledgeGraph and KnowledgeGraphCard components for knowledge base visualization
- Add comprehensive SVG assets for index page (apps, arrows, management icons)
- Add common API module for shared request utilities
- Extend knowledgeBase API with knowledge graph endpoints (getKnowledgeGraph, getKnowledgeGraphEntityTypes)
- Update i18n translations for English and Chinese with new index page strings
- Update routing configuration to include new Index route
- Update menu configuration to reflect new navigation structure
- Update KnowledgeBase CreateModal and Private view components
- Add TypeScript types for Index page components
- Improve overall UI/UX with new dashboard-style homepage

web/src/assets/images/index/arrow_down.svg

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="14px" height="14px" viewBox="0 0 14 14" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <title>箭头_向上</title>
+    <g id="V1.1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
+        <g id="首页" transform="translate(-928, -367)" fill="#FF5D34" fill-rule="nonzero">
+            <g id="核心数据" transform="translate(256, 216)">
+                <g id="编组-19备份-3" transform="translate(648, 0)">
+                    <g id="标签1" transform="translate(16, 148)">
+                        <g id="箭头_向上" transform="translate(15, 10) scale(1, -1) translate(-15, -10)translate(8, 3)">
+                            <polygon id="路径" points="7.58333789 4.21666211 7.58333789 12.4416621 6.41666211 12.4416621 6.41666211 4.21666211 4.60833789 6.025 3.79166211 5.20832422 7 2 10.2083379 5.20832422 9.39166211 6.025"></polygon>
+                        </g>
+                    </g>
+                </g>
+            </g>
+        </g>
+    </g>
+</svg>