feat(backend): add hybrid Dockerfile for Railway support

Author: Datakult0r

backend/Dockerfile

@@ -1,24 +1,34 @@
-# Use Node.js LTS
-FROM node:20-slim
+# Hybrid Node.js + Python Dockerfile for Railway (grantgoblin)
+FROM python:3.11-slim-bookworm
+
+# 1. Install System Dependencies & Node.js
+RUN apt-get update && apt-get install -y \
+    curl \
+    git \
+    build-essential \
+    && curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y nodejs \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 
-# Set working directory
 WORKDIR /app
 
-# Copy package files
-COPY package*.json ./
+# 2. Python Setup (Heavy dependencies)
+# Copy strict requirements or just the researcher one
+COPY ai-researcher/requirements.txt ./requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
-# Install dependencies
+# 3. Node.js Setup
+COPY package.json package-lock.json* ./
 RUN npm ci --only=production
 
-# Copy source code
+# 4. Copy Application Source
 COPY . .
 
-# Expose port
-EXPOSE 3000
-
-# Set environment variables
+# 5. Environment & Startup
 ENV NODE_ENV=production
-ENV PORT=3000
+ENV PYTHONUNBUFFERED=1
+EXPOSE 3000
 
-# Start the server
+# Start Express Server (which spawns Python scripts)
 CMD ["npm", "start"]