Assets as document: replace snapshot with publish workflow

Remove assets from the snapshot system and replace with a publish-based
document workflow that generates versioned ProseMirror documents.

- Remove snapshot_id/source_id from asset and asset_vendor models
- Delete AssetFilter (no longer needed without snapshot filtering)
- Add PublishAssetList service, GraphQL mutation, MCP tool, CLI command,
  and n8n operation
- Add asset_list_document_id column to generated_documents table
- Generate ProseMirror documents with asset inventory tables
  (name, type, amount, data types stored, owner, vendors)
- Add AssetListDocument resolver on Organization type
- Update frontend to remove snapshot routes/params and add publish dialog
- Add e2e tests for asset publish (immediate, with approvers, reuse, RBAC)
- Add migration script for converting legacy asset snapshots to documents
- Exclude ASSETS from snapshot type lists and e2e snapshot tests
- Move generated_documents SQL to coredata methods on Datum and Asset
- Clear generated document and SOA references on soft delete and archive

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/docgen/generator.go

@@ -311,6 +311,23 @@ type (
 		Owner          string
 		Vendors        string
 	}
+
+	AssetListData struct {
+		Title            string
+		OrganizationName string
+		CreatedAt        time.Time
+		TotalAssets      int
+		Rows             []AssetListRow
+	}
+
+	AssetListRow struct {
+		Name            string
+		AssetType       string
+		Amount          int
+		DataTypesStored string
+		Owner           string
+		Vendors         string
+	}
 )
 
 func BoolLabel(v bool) string {