Parameterize Docker Compose volume host paths (#3907)

.env.example

@@ -190,3 +190,10 @@ SEARXNG_INSTANCE=http://localhost:8080
 # These overlays only expose the GPU devices. The slim Odysseus image
 # still needs CUDA/ROCm userspace via Cookbook -> Dependencies (vLLM,
 # llama-cpp-python, etc.) before models can actually serve on GPU.
+
+# ============================================================
+# Storage Paths (Docker Compose)
+# ============================================================
+
+# APP_DATA_DIR=./data
+# APP_LOGS_DIR=./logs