fix(docker): download LFS files at startup instead of COPY

Docker COPY doesn't resolve Git LFS pointers. Instead, use a startup
script to download ONNX files from HuggingFace at container start.
This ensures ONNX model files are properly available for VS AI mode.

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

Dockerfile

@@ -2,28 +2,29 @@ FROM node:20-slim
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Build timestamp: 2026-01-17T16:30
+# Build timestamp: 2026-01-17T16:45
 
 WORKDIR /app
 
-# Install git and git-lfs for handling large files
-RUN apt-get update && apt-get install -y git git-lfs ca-certificates && git lfs install && rm -rf /var/lib/apt/lists/*
-
-# Clone the repository with LFS files - this properly resolves LFS pointers
-ARG REPO_URL=https://huggingface.co/spaces/k-l-lambda/trigo
-RUN git clone --depth 1 ${REPO_URL} /tmp/repo && \
-    cd /tmp/repo && \
-    git lfs pull && \
-    cp -r trigo-web/backend/src/ /app/backend/src/ && \
-    cp -r trigo-web/inc/ /app/inc/ && \
-    cp -r trigo-web/app/dist/ /app/app/dist/ && \
-    cp trigo-web/backend/package.json /app/package.json && \
-    cp trigo-web/backend/.env /app/backend/.env && \
-    rm -rf /tmp/repo
-
-# Install ALL deps (including dev for tsx)
+# Install curl for downloading LFS files at startup
+RUN apt-get update && apt-get install -y curl ca-certificates && rm -rf /var/lib/apt/lists/*
+
+# Copy backend package.json and install ALL deps (including dev for tsx)
+COPY trigo-web/backend/package.json ./package.json
 RUN npm install
 
+# Copy backend source
+COPY trigo-web/backend/src/ ./backend/src/
+
+# Copy inc folder
+COPY trigo-web/inc/ ./inc/
+
+# Copy frontend dist (ONNX files will be LFS pointers, we'll download them at startup)
+COPY trigo-web/app/dist/ ./app/dist/
+
+# Copy env files (only .env, .env.local is for local development only)
+COPY trigo-web/backend/.env ./backend/.env
+
 # Create a Docker-specific entry point that sets correct paths
 RUN echo 'import express from "express"; \
 import { createServer } from "http"; \
@@ -44,10 +45,37 @@ app.get("*", (req, res, next) => { if (req.path.startsWith("/health") || req.pat
 io.on("connection", (socket) => { console.log("Client connected:", socket.id); setupSocketHandlers(io, socket, gameManager); socket.on("disconnect", () => console.log("Client disconnected:", socket.id)); }); \
 httpServer.listen(PORT, "0.0.0.0", () => console.log("Server running on port " + PORT));' > docker-entry.ts
 
+# Create startup script that downloads LFS files before starting server
+RUN cat <<'STARTUP' > start.sh
+#!/bin/bash
+set -e
+
+HF_BASE="https://huggingface.co/spaces/k-l-lambda/trigo/resolve/main/trigo-web/app/dist"
+
+# List of ONNX files to download (relative to app/dist)
+ONNX_FILES=(
+    "onnx/20251230-trigo-value-llama-l6-h64-it2_251221-value0.01-pretrain/LlamaCausalLM_ep0036_evaluation.onnx"
+    "onnx/20251230-trigo-value-llama-l6-h64-it2_251221-value0.01-pretrain/LlamaCausalLM_ep0036_tree.onnx"
+)
+
+echo "Downloading ONNX model files..."
+for file in "${ONNX_FILES[@]}"; do
+    dir=$(dirname "app/dist/$file")
+    mkdir -p "$dir"
+    echo "  Downloading $file..."
+    curl -sL "$HF_BASE/$file" -o "app/dist/$file"
+done
+echo "ONNX files downloaded successfully."
+
+# Start the server
+exec npx tsx docker-entry.ts
+STARTUP
+RUN chmod +x start.sh
+
 ENV PORT=7860
 ENV HOST=0.0.0.0
 ENV NODE_ENV=production
 
 EXPOSE 7860
 
-CMD ["npx", "tsx", "docker-entry.ts"]
+CMD ["./start.sh"]