feat(auth): add Dockerfile for containerization

docs/task-08-create-dockerfile.md

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+# Task 8: Create Dockerfile
+
+## Task Description
+
+**Files:**
+- Create: `src/Fengling.AuthService/Dockerfile`
+- Create: `src/Fengling.AuthService/.dockerignore`
+
+## Implementation Steps
+
+### Step 1: Create Dockerfile
+
+Create: `src/Fengling.AuthService/Dockerfile`
+
+```dockerfile
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS base
+WORKDIR /app
+EXPOSE 80
+
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY ["Fengling.AuthService.csproj", "./"]
+RUN dotnet restore "Fengling.AuthService.csproj"
+COPY . .
+WORKDIR "/src"
+RUN dotnet build "Fengling.AuthService.csproj" -c Release -o /app/build
+
+FROM build AS publish
+RUN dotnet publish "Fengling.AuthService.csproj" -c Release -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "Fengling.AuthService.dll"]
+```
+
+### Step 2: Create .dockerignore
+
+Create: `src/Fengling.AuthService/.dockerignore`
+
+```
+bin/
+obj/
+Dockerfile
+.dockerignore
+*.md
+```
+
+### Step 3: Commit
+
+```bash
+git add src/Fengling.AuthService/Dockerfile src/Fengling.AuthService/.dockerignore
+git commit -m "feat(auth): add Dockerfile for containerization"
+```
+
+## Context
+
+This task adds Docker support for containerization. The multi-stage Dockerfile builds the project in a SDK container and copies only the runtime to a lightweight runtime container.
+
+**Tech Stack**: Docker, .NET 10.0
+
+## Verification
+
+- [ ] Dockerfile created with multi-stage build
+- [ ] .dockerignore created
+- [ ] Dockerfile uses .NET 10.0
+- [ ] Exposes port 80
+- [ ] Committed to git
+
+## Notes
+
+- Multi-stage build reduces image size
+- Only runtime container in final image
+- Ready for Kubernetes deployment

src/Fengling.AuthService/.dockerignore

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+bin/
+obj/
+Dockerfile
+.dockerignore
+*.md

src/Fengling.AuthService/Dockerfile

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+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS base
+WORKDIR /app
+EXPOSE 80
+
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY ["Fengling.AuthService.csproj", "./"]
+RUN dotnet restore "Fengling.AuthService.csproj"
+COPY . .
+WORKDIR "/src"
+RUN dotnet build "Fengling.AuthService.csproj" -c Release -o /app/build
+
+FROM build AS publish
+RUN dotnet publish "Fengling.AuthService.csproj" -c Release -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "Fengling.AuthService.dll"]