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

.env.development

@@ -18,7 +18,7 @@ MOMENTRY_WORKER_BATCH_SIZE=5
 DATABASE_URL=postgres://accusys@localhost:5432/momentry
 
 # MongoDB
-MONGODB_URL=mongodb://accusys:Test3200Test3200@localhost:27017/admin
+MONGODB_URL=mongodb://localhost:27017
 MONGODB_DATABASE=momentry
 
 # Redis
@@ -28,7 +28,7 @@ REDIS_PASSWORD=accusys
 # Qdrant Vector Database (same as production)
 QDRANT_URL=http://localhost:6333
 QDRANT_API_KEY=Test3200Test3200Test3200
-QDRANT_COLLECTION=chunks_v3
+QDRANT_COLLECTION=momentry_rule1
 
 # Paths
 MOMENTRY_OUTPUT_DIR=/Users/accusys/momentry/output_dev
@@ -51,7 +51,7 @@ MOMENTRY_CUT_TIMEOUT=3600
 MOMENTRY_DEFAULT_TIMEOUT=7200
 
 # Cache Settings
-MONGODB_CACHE_ENABLED=true
+MONGODB_CACHE_ENABLED=false
 MONGODB_CACHE_TTL_VIDEOS=300
 MONGODB_CACHE_TTL_SEARCH=300
 MONGODB_CACHE_TTL_HYBRID_SEARCH=600