feat: add data protection key management and update authentication settings

- Added support for data protection keys by integrating Entity Framework Core for key persistence.
- Updated `Program.cs` and `MemberCenterDbContext.cs` to configure data protection services.
- Introduced new migration to create `DataProtectionKeys` table in the database.
- Enhanced cookie settings for authentication to enforce security policies (SameSite=None, Secure=Always).
- Updated installation documentation with new authentication configuration options.

docs/INSTALL.md

@@ -41,6 +41,9 @@
 ASPNETCORE_ENVIRONMENT=Development
 ConnectionStrings__Default=Host=localhost;Database=member_center;Username=postgres;Password=postgres
 Auth__Issuer=http://localhost:7850/
+Auth__WebLoginUrl=http://localhost:5080/account/login
+Auth__AllowedLoginReturnUrlPrefixes=http://localhost:7850/
+Auth__AllowedLogoutReturnUrlPrefixes=http://localhost:5243/
 Auth__Resources__MemberCenter__Audience=member_center_api
 Auth__Resources__SendEngine__Audience=send_engine_api
 Auth__Resources__FileAccess__Audience=file_access_api
@@ -59,6 +62,12 @@ SendEngine__WebhookSecret=change-me
 - 規劃上將收斂為 DB resource registry；`.env` 僅作為初始 seed / 部署覆寫來源，不應再為每個新服務新增平行 hardcoded key。
 - `File Access` 已直接採用 resource registry 形式，不新增第三組硬編碼 audience 判斷。
 
+OIDC / Redirect login 設定說明：
+- `Auth__WebLoginUrl`: API `/oauth/authorize` 未登入時導向的 Web login URL。
+- `Auth__AllowedLoginReturnUrlPrefixes`: Web login 成功後允許 redirect 回去的 URL prefix，通常填 API issuer/base URL。
+- `Auth__AllowedLogoutReturnUrlPrefixes`: Web logout 後允許 redirect 的 URL prefix。
+- Identity cookie 固定使用 `SameSite=None`、`Secure=Always`、`Path=/`，因此 stage/prod 必須使用 HTTPS。
+
 `SendEngine` 設定說明：
 - `SendEngine__BaseUrl`: Send Engine API base URL
 - `SendEngine__WebhookSecret`: 與 Send Engine `Webhook:Secrets:member_center` 一致

src/MemberCenter.Api/Program.cs

@@ -25,7 +25,8 @@ var issuerUri = ParseAbsoluteUriOrThrow(issuer, "Auth:Issuer");
 var allowInsecureHttp = builder.Configuration.GetValue("Auth:AllowInsecureHttp", false);
 
 builder.Services.AddDataProtection()
-    .SetApplicationName("MemberCenter");
+    .SetApplicationName("MemberCenter")
+    .PersistKeysToDbContext<MemberCenterDbContext>();
 
 builder.Services.AddDbContext<MemberCenterDbContext>(options =>
 {
@@ -61,11 +62,9 @@ builder.Services.AddAuthentication(options =>
 
 builder.Services.ConfigureApplicationCookie(options =>
 {
-    var cookieDomain = builder.Configuration["Auth:CookieDomain"];
-    if (!string.IsNullOrWhiteSpace(cookieDomain))
-    {
-        options.Cookie.Domain = cookieDomain;
-    }
+    options.Cookie.Path = "/";
+    options.Cookie.SameSite = SameSiteMode.None;
+    options.Cookie.SecurePolicy = CookieSecurePolicy.Always;
 });
 
 builder.Services.AddOpenIddict()

src/MemberCenter.Infrastructure/MemberCenter.Infrastructure.csproj

@@ -6,6 +6,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.DataProtection.EntityFrameworkCore" Version="8.0.11" />
     <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="8.0.11" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.11" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.11">

src/MemberCenter.Infrastructure/Persistence/MemberCenterDbContext.cs

@@ -1,12 +1,13 @@
 using MemberCenter.Domain.Entities;
 using MemberCenter.Infrastructure.Identity;
+using Microsoft.AspNetCore.DataProtection.EntityFrameworkCore;
 using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore;
 
 namespace MemberCenter.Infrastructure.Persistence;
 
 public class MemberCenterDbContext
-    : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>
+    : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>, IDataProtectionKeyContext
 {
     public MemberCenterDbContext(DbContextOptions<MemberCenterDbContext> options)
         : base(options)
@@ -27,6 +28,7 @@ public class MemberCenterDbContext
     public DbSet<AuthResourceScope> AuthResourceScopes => Set<AuthResourceScope>();
     public DbSet<AuthClientUsagePermission> AuthClientUsagePermissions => Set<AuthClientUsagePermission>();
     public DbSet<FileAccessDownloadToken> FileAccessDownloadTokens => Set<FileAccessDownloadToken>();
+    public DbSet<DataProtectionKey> DataProtectionKeys { get; set; } = null!;
 
     protected override void OnModelCreating(ModelBuilder builder)
     {

src/MemberCenter.Infrastructure/Persistence/Migrations/20260430200729_AddDataProtectionKeys.cs

@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+
+#nullable disable
+
+namespace MemberCenter.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddDataProtectionKeys : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "DataProtectionKeys",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "integer", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    FriendlyName = table.Column<string>(type: "text", nullable: true),
+                    Xml = table.Column<string>(type: "text", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_DataProtectionKeys", x => x.Id);
+                });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "DataProtectionKeys");
+        }
+    }
+}

src/MemberCenter.Infrastructure/Persistence/Migrations/MemberCenterDbContextModelSnapshot.cs

@@ -783,6 +783,25 @@ namespace MemberCenter.Infrastructure.Persistence.Migrations
                     b.ToTable("users", (string)null);
                 });
 
+            modelBuilder.Entity("Microsoft.AspNetCore.DataProtection.EntityFrameworkCore.DataProtectionKey", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("integer");
+
+                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("FriendlyName")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Xml")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("DataProtectionKeys");
+                });
+
             modelBuilder.Entity("Microsoft.AspNetCore.Identity.IdentityRoleClaim<System.Guid>", b =>
                 {
                     b.Property<int>("Id")

src/MemberCenter.Web/Program.cs

@@ -19,7 +19,8 @@ EnvLoader.LoadDotEnvIfDevelopment();
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddDataProtection()
-    .SetApplicationName("MemberCenter");
+    .SetApplicationName("MemberCenter")
+    .PersistKeysToDbContext<MemberCenterDbContext>();
 
 builder.Services.AddDbContext<MemberCenterDbContext>(options =>
 {
@@ -70,11 +71,9 @@ if (!string.IsNullOrWhiteSpace(googleClientId) && !string.IsNullOrWhiteSpace(goo
 builder.Services.ConfigureApplicationCookie(options =>
 {
     options.LoginPath = "/account/login";
-    var cookieDomain = builder.Configuration["Auth:CookieDomain"];
-    if (!string.IsNullOrWhiteSpace(cookieDomain))
-    {
-        options.Cookie.Domain = cookieDomain;
-    }
+    options.Cookie.Path = "/";
+    options.Cookie.SameSite = SameSiteMode.None;
+    options.Cookie.SecurePolicy = CookieSecurePolicy.Always;
 
     options.Events = new CookieAuthenticationEvents
     {