fix: use /data for persistent storage on HF Spaces and Fly.io

SQLite, ChromaDB, and model caches now write to /data which is the
persistent volume mount point on both HF Spaces and Fly.io. This
ensures chat history, sensory memories, and caches survive container
restarts so returning users see their prior data on sign-in.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Dockerfile

@@ -31,7 +31,9 @@ COPY --chown=user . .
 # Copy the built React app from the frontend-builder stage
 COPY --from=frontend-builder --chown=user /app/frontend/dist /home/user/app/frontend/dist
 
-# Create a data directory for persistent storage
+# Create data directories for persistent storage
+# /data is the HF Spaces persistent volume mount point
+RUN mkdir -p /data && chown -R user:user /data
 RUN mkdir -p /home/user/app/data && chown -R user:user /home/user/app/data
 
 USER user
@@ -39,11 +41,11 @@ USER user
 ENV PORT=7860
 ENV HOME=/home/user
 ENV PATH=/home/user/.local/bin:$PATH
-ENV TORCH_HOME=/home/user/app/data/.cache/torch
-ENV HF_HOME=/home/user/app/data/.cache/huggingface
-ENV XDG_CACHE_HOME=/home/user/app/data/.cache
-ENV CHROMA_DB_PATH=/home/user/app/data/chroma_db
-ENV SQLITE_DB_PATH=/home/user/app/data/soma_sessions.db
+ENV TORCH_HOME=/data/.cache/torch
+ENV HF_HOME=/data/.cache/huggingface
+ENV XDG_CACHE_HOME=/data/.cache
+ENV CHROMA_DB_PATH=/data/chroma_db
+ENV SQLITE_DB_PATH=/data/soma_sessions.db
 
 EXPOSE 8080
 

fly.toml

@@ -5,8 +5,8 @@ primary_region = "sin"
 
 [env]
   PORT = "8080"
-  CHROMA_DB_PATH = "/home/user/app/data/chroma_db"
-  SQLITE_DB_PATH = "/home/user/app/data/soma_sessions.db"
+  CHROMA_DB_PATH = "/data/chroma_db"
+  SQLITE_DB_PATH = "/data/soma_sessions.db"
 
 [http_service]
   internal_port = 8080
@@ -17,4 +17,4 @@ primary_region = "sin"
 
 [[mounts]]
   source = "soma_data"
-  destination = "/home/user/app/data"
+  destination = "/data"