Versioned PRODUCT.md library + marketplace — backend (Slice 4)

Mirrors the agent-profile stack for products: ProductProfile entity (org-scoped,
versioned by org+key+version; null org = free builtin), a PRODUCT.md parser + writer,
and endpoints — upload, list, marketplace, get, publish/unpublish, fork, install, and
apply-to-product (sets Product.Identity to the profile's PRODUCT.md). Reuses the shared
ProfileOrigin/Status/Visibility enums; product profiles are gated owner-level
(CreateProductsAndTeams). Adds the product_profiles table.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Modules/TeamUp.Modules.OrgBoard/Endpoints/OrgBoardDtos.cs

@@ -100,3 +100,28 @@ internal sealed record AgentProfileSummary(
 internal sealed record AgentProfileDetail(AgentProfileSummary Profile, string Body);
 
 internal sealed record MarketplaceProfileEntry(AgentProfileSummary Profile, bool AlreadyInLibrary);
+
+internal sealed record UploadProductProfileRequest(Guid OrganizationId, string Content);
+
+internal sealed record PublishProductProfileRequest(Guid OrganizationId, string Version);
+
+internal sealed record ForkProductProfileRequest(Guid OrganizationId, string Version, string? Name = null);
+
+internal sealed record InstallProductProfileRequest(Guid OrganizationId, Guid SourceProfileId);
+
+internal sealed record ApplyProductProfileRequest(Guid OrganizationId, Guid ProductId, string Version);
+
+internal sealed record ProductProfileSummary(
+    Guid Id,
+    Guid? OrganizationId,
+    string Origin,
+    string ProfileKey,
+    string Name,
+    string Version,
+    string? Summary,
+    string Visibility,
+    string Status);
+
+internal sealed record ProductProfileDetail(ProductProfileSummary Profile, string Body);
+
+internal sealed record MarketplaceProductProfileEntry(ProductProfileSummary Profile, bool AlreadyInLibrary);