feat: compose stable product surfaces

src/govoplan_core/server/platform.py

@@ -22,7 +22,9 @@ from govoplan_core.core.modules import (
     FrontendRoute,
     ModuleManifest,
     NavItem,
+    ProductAvailabilityExplanation,
     ProductAreaContribution,
+    ProductSurfaceContribution,
     PublicFrontendRoute,
     QuickAccessTool,
     SUPPORTED_PRESENTATION_CONTRACT_VERSION,
@@ -254,6 +256,47 @@ def _product_area_payload(area: ProductAreaContribution) -> dict[str, object]:
     }
 
 
+def _product_availability_payload(
+    explanation: ProductAvailabilityExplanation,
+) -> dict[str, object]:
+    return {
+        "reason": explanation.reason,
+        "title": explanation.title,
+        "description": explanation.description,
+        "resolution": explanation.resolution,
+        "responsible_role": explanation.responsible_role,
+    }
+
+
+def _product_surface_payload(surface: ProductSurfaceContribution) -> dict[str, object]:
+    return {
+        "contract_version": surface.contract_version,
+        "id": surface.id,
+        "module_id": surface.module_id,
+        "label": surface.label,
+        "description": surface.description,
+        "icon": surface.icon,
+        "entry_path": surface.entry_path,
+        "route_path": surface.route_path,
+        "surface_ids": list(surface.surface_ids),
+        "presentations": list(surface.presentations),
+        "capability_ids": list(surface.capability_ids),
+        "search_source_ids": list(surface.search_source_ids),
+        "help_context_ids": list(surface.help_context_ids),
+        "documentation_topic_ids": list(surface.documentation_topic_ids),
+        "required_all": list(surface.required_all),
+        "required_any": list(surface.required_any),
+        "aliases": list(surface.aliases),
+        "order": surface.order,
+        "unavailable": _product_availability_payload(surface.unavailable),
+        "degraded": (
+            _product_availability_payload(surface.degraded)
+            if surface.degraded is not None
+            else None
+        ),
+    }
+
+
 def _quick_access_tool_payload(tool: QuickAccessTool) -> dict[str, object]:
     return {
         "id": tool.id,
@@ -372,6 +415,10 @@ def _frontend_payload(
         "product_areas": [
             _product_area_payload(area) for area in frontend.product_areas
         ],
+        "product_surfaces": [
+            _product_surface_payload(surface)
+            for surface in frontend.product_surfaces
+        ],
         "quick_access_tools": [
             _quick_access_tool_payload(tool) for tool in frontend.quick_access_tools
         ],