fix(docker): install git-lfs to fetch large model files

Added git and git-lfs installation to Docker build to properly resolve
LFS pointers for ONNX model files. The COPY command may only get LFS
pointers, so we need to explicitly pull the actual files.

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

Dockerfile

@@ -2,10 +2,13 @@ FROM node:20-slim
 
 ENV DEBIAN_FRONTEND=noninteractive
 
-# Build timestamp: 2026-01-13T17:50
+# Build timestamp: 2026-01-17T16:00
 
 WORKDIR /app
 
+# Install git and git-lfs for handling large files
+RUN apt-get update && apt-get install -y git git-lfs && git lfs install && 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
@@ -19,6 +22,12 @@ COPY trigo-web/inc/ ./inc/
 # Copy frontend dist
 COPY trigo-web/app/dist/ ./app/dist/
 
+# Fetch LFS files (in case COPY only got pointers)
+COPY .git/ ./.git/
+COPY .gitattributes ./
+RUN git lfs pull || true
+RUN rm -rf .git .gitattributes
+
 # Copy env files (only .env, .env.local is for local development only)
 COPY trigo-web/backend/.env ./backend/.env