feat(FN-3785): add standalone HTML rendering and export routes for reports

Adds a complete HTML rendering and export pipeline to the fusion-plugin-reports plugin, including a standalone HTML renderer with template and stylesheet support, new export routes (`/api/reports/:id/export/html`) that persist rendered HTML to the store, and plugin-type support for non-JSON route re

Fusion-Task-Id: FN-3785

plugins/fusion-plugin-reports/package.json

@@ -8,6 +8,10 @@
     ".": {
       "types": "./src/index.ts",
       "import": "./src/index.ts"
+    },
+    "./render": {
+      "types": "./src/render/index.ts",
+      "import": "./src/render/index.ts"
     }
   },
   "scripts": {