feat(behandelportal): WP-64 werkvoorraad (queue) screen

New GET /werkvoorraad endpoint lists aanvragen still open (Ingediend/InBehandeling),
gated by the medewerker capability (CanBeoordelen) rather than the admin role — reuses
the existing ApplicationSummaryDto, no new DTO. GET /me now surfaces aanvraag:beoordelen
for a behandelaar so the FE can gate with the same AccessStore/capabilityGuard idiom
every other page uses.

FE: a behandeling domain type deliberately narrower than ssp's full AanvraagStatus
union (only the two open tags — illegal states unrepresentable), composed into a
werkvoorraad-list organism from existing shared/ui molecules. Replaces WP-61's
scaffold placeholder as the app's real landing page.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/swagger.json

@@ -766,6 +766,38 @@
         }
       }
     },
+    "/api/v1/werkvoorraad": {
+      "get": {
+        "tags": [
+          "BigRegister.Api, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "array",
+                  "items": {
+                    "$ref": "#/components/schemas/ApplicationSummaryDto"
+                  }
+                }
+              }
+            }
+          },
+          "403": {
+            "description": "Forbidden",
+            "content": {
+              "application/problem+json": {
+                "schema": {
+                  "$ref": "#/components/schemas/ProblemDetails"
+                }
+              }
+            }
+          }
+        }
+      }
+    },
     "/api/v1/admin/cases/{id}": {
       "delete": {
         "tags": [