Add Docker support

Docker configuration:
- Dockerfile: Multi-stage build with non-root user, health checks
- Dockerfile.migrations: Runs EF Core migrations on startup
- docker-compose.yml: Full stack with SQL Server, Azurite, app
- .dockerignore: Optimized build context
- .env.example: Template for API keys

Application changes:
- Added /health endpoint with EF Core database check
- Conditional HTTPS redirect (disabled in containers)
- DOTNET_RUNNING_IN_CONTAINER environment detection

Usage:
  cp .env.example .env  # Add your API keys
  docker-compose up -d  # Start all services

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile.migrations

@@ -0,0 +1,26 @@
+# Migrations runner
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+WORKDIR /src
+
+# Install EF Core tools
+RUN dotnet tool install --global dotnet-ef
+ENV PATH="$PATH:/root/.dotnet/tools"
+
+# Copy solution and project files
+COPY TrueCV.sln ./
+COPY src/TrueCV.Domain/TrueCV.Domain.csproj src/TrueCV.Domain/
+COPY src/TrueCV.Application/TrueCV.Application.csproj src/TrueCV.Application/
+COPY src/TrueCV.Infrastructure/TrueCV.Infrastructure.csproj src/TrueCV.Infrastructure/
+COPY src/TrueCV.Web/TrueCV.Web.csproj src/TrueCV.Web/
+
+# Restore dependencies
+RUN dotnet restore
+
+# Copy all source code
+COPY src/ src/
+
+# Build the project
+RUN dotnet build src/TrueCV.Web/TrueCV.Web.csproj -c Release
+
+# Run migrations on startup
+ENTRYPOINT ["dotnet", "ef", "database", "update", "--project", "src/TrueCV.Infrastructure", "--startup-project", "src/TrueCV.Web", "--no-build", "-c", "Release"]