feat(catalog): list an item's collections on its detail page

contracts/api/v2/fixtures/admin_item_metadata_updated.json

@@ -9,5 +9,13 @@
   "crew": [],
   "versions": [],
   "ratings": [],
-  "subtitles": []
+  "subtitles": [],
+  "collections": [
+    {
+      "id": "oscar-winners",
+      "title": "Oscar Winners",
+      "poster_url": "https://cdn.example.invalid/oscar-winners.jpg",
+      "item_count": 12
+    }
+  ]
 }

contracts/api/v2/fixtures/get_catalog_item_ok.json

@@ -81,5 +81,13 @@
       "display": "8.3"
     }
   ],
-  "subtitles": []
+  "subtitles": [],
+  "collections": [
+    {
+      "id": "oscar-winners",
+      "title": "Oscar Winners",
+      "poster_url": "https://cdn.example.invalid/oscar-winners.jpg",
+      "item_count": 12
+    }
+  ]
 }

contracts/api/v2/fixtures/get_item_collections_capability_authentication_required.json

@@ -0,0 +1,7 @@
+{
+  "type": "https://siloserver.org/docs/api/v2/problems/authentication_required",
+  "title": "Authentication required",
+  "status": 401,
+  "detail": "Authentication is required.",
+  "instance": "urn:silo:request:0000000000000000000002cc"
+}

contracts/api/v2/fixtures/get_item_collections_capability_ok.json

@@ -0,0 +1,5 @@
+{
+  "revision": "0c37f6ac3b88f5930ce78f264098826e315b407b99d69ada19e944f3ae2806aa",
+  "state": "available",
+  "allowed": true
+}

contracts/api/v2/fixtures/get_system_info_ok.json

@@ -1,7 +1,7 @@
 {
   "server_version": "unavailable",
   "api_major": 2,
-  "contract_digest": "319d3fd749750be47e2afd419cf4dfef132d479e327f3510088c37e99006c3a1",
+  "contract_digest": "d9c6f3495ff0b0d10ae5f5a562da2fb80e4bf884c7ab7b74d67f644672fb9551",
   "links": {
     "openapi": "/api/v2/openapi.json",
     "capabilities": "/api/v2/capabilities",

contracts/api/v2/fixtures/index.json

@@ -6554,6 +6554,44 @@
       "schema": "#/components/schemas/ImageCapabilities",
       "body_file": "get_image_capabilities_ok.json"
     },
+    {
+      "name": "get_item_collections_capability_authentication_required",
+      "operation_id": "getItemCollectionsCapability",
+      "scenario": "The item-collections capability document without a credential.",
+      "request": {
+        "method": "GET",
+        "path": "/api/v2/capabilities/item-collections"
+      },
+      "expected_status": 401,
+      "response_headers": {
+        "Cache-Control": "no-store",
+        "Content-Type": "application/problem+json"
+      },
+      "response_media_type": "application/problem+json",
+      "schema": "#/components/schemas/Problem",
+      "body_file": "get_item_collections_capability_authentication_required.json"
+    },
+    {
+      "name": "get_item_collections_capability_ok",
+      "operation_id": "getItemCollectionsCapability",
+      "scenario": "The item-collections capability document on a server whose item detail carries the collections row.",
+      "request": {
+        "method": "GET",
+        "path": "/api/v2/capabilities/item-collections",
+        "headers": {
+          "Authorization": "Bearer tok-member",
+          "X-Profile-Id": "p-owner"
+        }
+      },
+      "expected_status": 200,
+      "response_headers": {
+        "Cache-Control": "private, no-cache",
+        "Content-Type": "application/json"
+      },
+      "response_media_type": "application/json",
+      "schema": "#/components/schemas/ItemCollectionsCapability",
+      "body_file": "get_item_collections_capability_ok.json"
+    },
     {
       "name": "get_item_markers_ok",
       "operation_id": "getItemMarkers",