feat: add knowledge management functionality with CRUD operations and database schema

- Implemented KnowledgeHandler for managing knowledge groups and items, including listing, creating, updating, and deleting operations.
- Added database migration scripts to create necessary tables for knowledge management, including knowledge_groups, knowledge_items, knowledge_parse_tasks, and knowledge_chunks_meta.
- Introduced prompt_rule_knowledge_groups table to associate prompt rules with knowledge groups.

apps/admin-web/src/views/KnowledgeView.vue.patch

@@ -0,0 +1,10 @@
+--- /Users/liangxu/Documents/test/geo-rankly/apps/admin-web/src/views/KnowledgeView.vue
++++ /Users/liangxu/Documents/test/geo-rankly/apps/admin-web/src/views/KnowledgeView.vue
+@@ -37,6 +37,5 @@
+ const itemForm = reactive({
+-  group_id: undefined as number | undefined,
+-  name: "",
++  group_ids: [] as number[],
+   url: "",
+   content: "",
+ });