Add monorepo configuration and development environment

.devcontainer/Dockerfile

@@ -0,0 +1,34 @@
+FROM node:18-bullseye
+
+# Install additional tools including Ionic CLI
+RUN apt-get update && apt-get install -y \
+    git \
+    curl \
+    vim \
+    mongodb-clients \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install global npm packages for development
+RUN npm install -g \
+    @ionic/cli \
+    @angular/cli \
+    nodemon \
+    concurrently \
+    eslint \
+    prettier
+
+# Set working directory
+WORKDIR /workspaces/PfosiLooking
+
+# Copy package files for dependency caching
+COPY package*.json ./
+COPY app/package*.json ./app/
+COPY backend/package*.json ./backend/
+
+# Install dependencies
+RUN npm install
+RUN cd app && npm install
+RUN cd backend && npm install
+
+# Keep container running
+CMD ["sleep", "infinity"]