added inventory, updated DB

inventory-service/Dockerfile

@@ -0,0 +1,22 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    postgresql-client \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Create non-root user
+RUN useradd -m -u 1000 inventory && chown -R inventory:inventory /app
+USER inventory
+
+# Default command
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]