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.

server/configs/config.local.yaml.example

@@ -15,6 +15,20 @@ database:
 redis:
   addr: localhost:6379
 
+qdrant:
+  url: localhost:6334
+  collection: geo_knowledge_chunks
+  timeout: 15s
+
+object_storage:
+  provider: minio
+  endpoint: localhost:9000
+  bucket: geo-private
+  use_ssl: false
+  # Prefer environment override for secrets:
+  # export OBJECT_STORAGE_ACCESS_KEY=minioadmin
+  # export OBJECT_STORAGE_SECRET_KEY=minioadmin
+
 jwt:
   secret: "your-local-secret"
 
@@ -31,6 +45,23 @@ llm:
   # Prefer environment override for secrets:
   # export LLM_API_KEY=your-api-key
 
+retrieval:
+  provider: siliconflow
+  base_url: https://api.siliconflow.cn/v1
+  embedding_model: BAAI/bge-m3
+  reranker_model: BAAI/bge-reranker-v2-m3
+  timeout: 30s
+  chunk_size: 900
+  chunk_overlap: 120
+  embedding_batch_size: 16
+  recall_limit: 12
+  rerank_top_n: 6
+  max_chunks_per_doc: 6
+  overlap_tokens: 60
+  # Prefer environment override for retrieval api key:
+  # export SILICONFLOW_API_KEY=your-siliconflow-api-key
+  # or export RETRIEVAL_API_KEY=your-retrieval-api-key
+
 generation:
   queue_size: 128
   worker_concurrency: 1