feat: fix Chinese text search and duplicate chunk_id bug

- Add helper functions to extract text from nested content structure
- Update SearchResult to include uuid field
- Add PostgreSQL function get_chunk_by_chunk_id_and_uuid to handle duplicate chunk_ids
- Update Qdrant search functions to extract uuid from payload
- Change embedding model to nomic-embed-text-v2-moe:latest
- Update Qdrant collection name to momentry_rule1
- Fix MongoDB authentication and disable cache for development
- Improve error handling in processor.rs
- Update documentation with new embedding model

src/core/db/mod.rs

@@ -5,6 +5,7 @@ use crate::core::chunk::Chunk;
 
 #[derive(Debug, Clone)]
 pub struct SearchResult {
+    pub uuid: String,
     pub chunk_id: String,
     pub score: f32,
 }