refactor: move app directories

llm/requirements.txt

@@ -0,0 +1,20 @@
+# --- Core AI Framework ---
+langchain
+langchain-community
+langchain-text-splitters
+
+# --- API & Server ---
+fastapi
+uvicorn[standard]
+
+# --- Vector Database ---
+chromadb
+
+# --- Embedding Model Dependencies ---
+sentence-transformers
+nomic
+
+# --- Deep Learning Backend for Embeddings ---
+torch
+
+einops