deploy: Add unified Docker deployment files for Hugging Face Spaces

Dockerfile

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+# Build Frontend
+FROM node:20-slim AS frontend-builder
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/package-lock.json* ./
+RUN npm install
+COPY frontend/ .
+# Set API base to empty so it uses relative paths (handled by Nginx)
+ENV NEXT_PUBLIC_API_BASE=""
+RUN npm run build
+
+# Final Image
+FROM python:3.12-slim
+WORKDIR /app
+
+# Install Node.js (for running frontend in dev/ssr mode) and Nginx
+RUN apt-get update && apt-get install -y \
+    curl \
+    nginx \
+    && curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy Backend
+COPY backend/requirements.txt ./backend/
+RUN pip install --no-cache-dir -r backend/requirements.txt
+# Install missing deps found earlier
+RUN pip install --no-cache-dir sqlalchemy==2.0.49 pymysql cryptography
+
+COPY backend/ ./backend/
+
+# Copy Frontend Build
+COPY --from=frontend-builder /app/frontend/.next ./frontend/.next
+COPY --from=frontend-builder /app/frontend/public ./frontend/public
+COPY --from=frontend-builder /app/frontend/package.json ./frontend/package.json
+COPY --from=frontend-builder /app/frontend/node_modules ./frontend/node_modules
+
+# Nginx Config
+COPY nginx.conf /etc/nginx/sites-available/default
+
+# Start Script
+COPY start.sh .
+RUN chmod +x start.sh
+
+# Expose HF Port
+EXPOSE 7860
+
+CMD ["./start.sh"]

nginx.conf

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+server {
+    listen 7860;
+    server_name localhost;
+
+    location / {
+        proxy_pass http://localhost:3000;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
+    }
+
+    location /api {
+        proxy_pass http://localhost:8000/api;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /health {
+        proxy_pass http://localhost:8000/health;
+        proxy_set_header Host $host;
+    }
+}

start.sh

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+#!/bin/bash
+
+# Start Backend
+cd /app/backend && uvicorn app.main:app --host 0.0.0.0 --port 8000 &
+
+# Start Frontend
+cd /app/frontend && npm run start -- -p 3000 &
+
+# Start Nginx
+nginx -g "daemon off;"