Chore: Add Docker containerization support

- Add Dockerfile with multi-stage build for .NET 8
- Include ImageMagick dependencies for Magick.NET
- Add docker-compose.yml with volume mount for receipts
- Add .dockerignore to exclude build artifacts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

MoneyMap/.dockerignore

@@ -0,0 +1,7 @@
+bin/
+obj/
+.vs/
+*.user
+*.suo
+appsettings.Development.json
+wwwroot/receipts/

MoneyMap/Dockerfile

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+# Build stage
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+WORKDIR /src
+
+# Copy csproj and restore dependencies
+COPY MoneyMap.csproj .
+RUN dotnet restore
+
+# Copy everything else and build
+COPY . .
+RUN dotnet publish -c Release -o /app/publish
+
+# Runtime stage
+FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS runtime
+WORKDIR /app
+
+# Install ImageMagick dependencies for Magick.NET
+RUN apt-get update && apt-get install -y \
+    libmagickwand-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy published app
+COPY --from=build /app/publish .
+
+# Create directory for receipts
+RUN mkdir -p /app/receipts
+
+# Expose port
+EXPOSE 5010
+
+# Set environment variables
+ENV ASPNETCORE_URLS=http://+:5010
+ENV ASPNETCORE_ENVIRONMENT=Production
+
+ENTRYPOINT ["dotnet", "MoneyMap.dll"]

docker-compose.yml

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+services:
+  moneymap:
+    build:
+      context: ./MoneyMap
+      dockerfile: Dockerfile
+    container_name: moneymap
+    ports:
+      - "5010:5010"
+    environment:
+      - ConnectionStrings__MoneyMapDb=Server=barge.lan;Database=MoneyMap;User Id=moneymap;Password=YOUR_PASSWORD;TrustServerCertificate=True;
+      - Receipts__StoragePath=/app/receipts
+      - OPENAI_API_KEY=${OPENAI_API_KEY}
+    volumes:
+      - /mnt/docker-data/moneymap/receipts:/app/receipts
+    restart: unless-stopped