feat: V2 microservices stack — backend services, gateway, JWT auth

Add full V2 architecture: identity, content, studio (.NET 10) and file,
render, notification, gateway (Go) services with vendored deps, plus DB
migrations, event/API contracts, and an init-db script.

Wire the Next.js frontend to the gateway: server-side JWT auth routes
(login/register/refresh/logout/me), gateway fetch helper, and session/
cookie/jwt helpers under src/lib.

Containerize the stack via docker-compose.v2.yml and per-service
Dockerfiles. Base images resolve through a Nexus mirror (Docker Hub) and
MCR directly; npm/NuGet pull from Nexus groups. Self-host fonts via
next/font/local to avoid Google Fonts (geo-blocked).

Add CI workflow and ignore .env.v2, *.stackdump, and .NET bin/obj.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

services/content/FlatRender.ContentSvc/Domain/Entities/Scene.cs

@@ -0,0 +1,297 @@
+using FlatRender.ContentSvc.Domain.Enums;
+
+namespace FlatRender.ContentSvc.Domain.Entities;
+
+public class Scene
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid ProjectId { get; set; }
+    public Project Project { get; set; } = default!;
+
+    public string Key { get; set; } = default!;
+    public string Title { get; set; } = default!;
+    public string? LocalizedTitle { get; set; }
+
+    public SceneKind SceneType { get; set; } = SceneKind.Normal;
+
+    public string? Image { get; set; }
+    public string? Demo { get; set; }
+    public string? SceneColorSvg { get; set; }
+    public string? SnapshotUrl { get; set; }
+
+    public bool GenerateKf { get; set; }
+
+    public decimal? DefaultDurationSec { get; set; }
+    public decimal? MinDurationSec { get; set; }
+    public decimal? MaxDurationSec { get; set; }
+    public decimal OverlapAtEndSec { get; set; }
+    public bool CanHandleDuration { get; set; } = true;
+
+    public bool ManualColorSelection { get; set; }
+
+    public int Sort { get; set; }
+    public bool IsActive { get; set; } = true;
+
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? DeletedAt { get; set; }
+
+    public ICollection<RepeaterItem> RepeaterItems { get; set; } = [];
+    public ICollection<SceneContentElement> ContentElements { get; set; } = [];
+    public ICollection<SceneColorElement> ColorElements { get; set; } = [];
+    public ICollection<SceneColorPreset> ColorPresets { get; set; } = [];
+    public ICollection<SceneCharacter> Characters { get; set; } = [];
+    public ICollection<SceneCategory> SceneCategories { get; set; } = [];
+}
+
+public class RepeaterItem
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid SceneId { get; set; }
+    public Scene Scene { get; set; } = default!;
+
+    public string Title { get; set; } = default!;
+    public string RepeatBoxKey { get; set; } = default!;
+    public string RepeatItemKey { get; set; } = default!;
+
+    public int MaxRepeatCount { get; set; } = 10;
+    public bool UserCanChangeSort { get; set; } = true;
+    public RepeatSortStrategy RepeatSortStrategy { get; set; } = RepeatSortStrategy.Manual;
+
+    public int Sort { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+
+    public ICollection<SceneContentElement> ContentElements { get; set; } = [];
+}
+
+public class SceneContentElement
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid SceneId { get; set; }
+    public Scene Scene { get; set; } = default!;
+    public Guid? RepeaterItemId { get; set; }
+
+    public string Key { get; set; } = default!;
+    public string Title { get; set; } = default!;
+    public string? LocalizedTitle { get; set; }
+    public string? Hint { get; set; }
+
+    public ContentElementType Type { get; set; }
+    public string? DefaultValue { get; set; }
+
+    // Text
+    public Guid? FontId { get; set; }
+    public string? FontFace { get; set; }
+    public string? FontFaceName { get; set; }
+    public int? FontSize { get; set; }
+    public int? DefaultFontSize { get; set; }
+    public string? DefaultFontFace { get; set; }
+    public bool IsFontChangeable { get; set; } = true;
+    public bool IsFontSizeChangeable { get; set; } = true;
+    public JustifyKind Justify { get; set; } = JustifyKind.CENTER_JUSTIFY;
+    public bool CanJustify { get; set; } = true;
+    public int PositionInContainer { get; set; }
+    public bool IsTextBox { get; set; }
+    public int? MaxSize { get; set; }
+    public string? DirectionLayerKey { get; set; }
+    public int DirectionLayerValue { get; set; }
+
+    // Media
+    public bool VideoSupport { get; set; }
+    public decimal? MinDurationSec { get; set; }
+    public decimal? MaxDurationSec { get; set; }
+    public int? Width { get; set; }
+    public int? Height { get; set; }
+    public string? Thumbnail { get; set; }
+
+    // Misc
+    public string? MappedList { get; set; }
+    public string? CounterMode { get; set; }
+    public AiInputType AiInputType { get; set; } = AiInputType.None;
+    public bool IsHidden { get; set; }
+    public bool IsFocused { get; set; }
+    public string? OpacityControllerKey { get; set; }
+
+    // Legacy design pattern variants
+    public string? Dp1Image { get; set; }
+    public string? Dp1Title { get; set; }
+    public string? Dp2Image { get; set; }
+    public string? Dp2Title { get; set; }
+    public string? Dp3Image { get; set; }
+    public string? Dp3Title { get; set; }
+    public string? Dp4Image { get; set; }
+    public string? Dp4Title { get; set; }
+
+    public int VirtualCount { get; set; } = 1;
+    public int Sort { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public class SceneColorElement
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid SceneId { get; set; }
+    public Scene Scene { get; set; } = default!;
+
+    public string ElementKey { get; set; } = default!;
+    public string Title { get; set; } = default!;
+    public string? Icon { get; set; }
+    public AttrValueKind AttrValue { get; set; } = AttrValueKind.fill;
+    public string DefaultColor { get; set; } = default!;
+
+    public int Sort { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public class SceneColorPreset
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid SceneId { get; set; }
+    public string? Name { get; set; }
+    public int Sort { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public ICollection<SceneColorPresetItem> Items { get; set; } = [];
+}
+
+public class SceneColorPresetItem
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid PresetId { get; set; }
+    public SceneColorPreset Preset { get; set; } = default!;
+    public string ElementKey { get; set; } = default!;
+    public string Value { get; set; } = default!;
+    public int Sort { get; set; }
+}
+
+public class SharedColor
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid ProjectId { get; set; }
+    public Project Project { get; set; } = default!;
+
+    public string ElementKey { get; set; } = default!;
+    public string Title { get; set; } = default!;
+    public string? Icon { get; set; }
+    public AttrValueKind AttrValue { get; set; } = AttrValueKind.fill;
+    public string DefaultColor { get; set; } = default!;
+
+    public int Sort { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public class SharedLayer
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid ProjectId { get; set; }
+    public Project Project { get; set; } = default!;
+
+    public string Key { get; set; } = default!;
+    public string Title { get; set; } = default!;
+    public string? LocalizedTitle { get; set; }
+    public string? Hint { get; set; }
+
+    public ContentElementType Type { get; set; }
+    public string? DefaultValue { get; set; }
+
+    public Guid? FontId { get; set; }
+    public string? FontFace { get; set; }
+    public string? FontFaceName { get; set; }
+    public int? FontSize { get; set; }
+    public int? DefaultFontSize { get; set; }
+    public string? DefaultFontFace { get; set; }
+    public bool IsFontChangeable { get; set; } = true;
+    public bool IsFontSizeChangeable { get; set; } = true;
+    public JustifyKind Justify { get; set; } = JustifyKind.CENTER_JUSTIFY;
+    public bool CanJustify { get; set; } = true;
+    public int PositionInContainer { get; set; }
+    public bool IsTextBox { get; set; }
+    public int? MaxSize { get; set; }
+    public string? DirectionLayerKey { get; set; }
+    public int DirectionLayerValue { get; set; }
+
+    public bool VideoSupport { get; set; }
+    public decimal? MinDurationSec { get; set; }
+    public decimal? MaxDurationSec { get; set; }
+    public int? Width { get; set; }
+    public int? Height { get; set; }
+    public string? Thumbnail { get; set; }
+
+    public string? MappedList { get; set; }
+    public string? CounterMode { get; set; }
+    public AiInputType AiInputType { get; set; } = AiInputType.None;
+    public bool IsHidden { get; set; }
+    public bool IsFocused { get; set; }
+
+    // Legacy design pattern variants
+    public string? Dp1Image { get; set; }
+    public string? Dp1Title { get; set; }
+    public string? Dp2Image { get; set; }
+    public string? Dp2Title { get; set; }
+    public string? Dp3Image { get; set; }
+    public string? Dp3Title { get; set; }
+    public string? Dp4Image { get; set; }
+    public string? Dp4Title { get; set; }
+
+    public int VirtualCount { get; set; } = 1;
+    public int Sort { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public class SceneCategory
+{
+    public Guid SceneId { get; set; }
+    public Scene Scene { get; set; } = default!;
+    public Guid CategoryId { get; set; }
+    public Category Category { get; set; } = default!;
+}
+
+public class SharedColorPreset
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid ProjectId { get; set; }
+    public Project Project { get; set; } = default!;
+    public string? Name { get; set; }
+    public int Sort { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+    public ICollection<SharedColorPresetItem> Items { get; set; } = [];
+}
+
+public class SharedColorPresetItem
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid PresetId { get; set; }
+    public SharedColorPreset Preset { get; set; } = default!;
+    public string ElementKey { get; set; } = default!;
+    public string Value { get; set; } = default!;
+    public int Sort { get; set; }
+}
+
+public class TemplateSvgPreview
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid? ProjectId { get; set; }
+    public Guid? SceneId { get; set; }
+
+    public string? SourceImageUrl { get; set; }
+    public string SvgUrl { get; set; } = default!;
+    public string? ThumbnailUrl { get; set; }
+
+    public string ColorZones { get; set; } = "[]";
+
+    public int? Width { get; set; }
+    public int? Height { get; set; }
+    public string? GenerationMethod { get; set; }
+    public bool GeneratedByAi { get; set; }
+    public decimal? QualityScore { get; set; }
+
+    public Guid? CreatedByUserId { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}