config: switch LLM to qwen3:0.6b, timeouts to 60s

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.lightrag

@@ -1,6 +1,6 @@
 # LLM via Ollama
 LLM_BINDING=ollama
-LLM_MODEL=qwen2.5:7b
+LLM_MODEL=qwen3:0.6b
 LLM_BINDING_HOST=http://localhost:11434
 
 # Embeddings via Ollama
@@ -13,8 +13,8 @@ EMBEDDING_DIM=1024
 RAG_DIR=./rag_storage
 
 # Timeouts (in seconds) — increase for large local models
-EMBEDDING_TIMEOUT=300
-TIMEOUT=600
+EMBEDDING_TIMEOUT=60
+TIMEOUT=60
 
 # Server
 HOST=0.0.0.0