feat(reports): partner and platform analytics

Partner reports — health cohorts, revenue-by-plan, top customers, signup/churn cohorts, plus saved custom reports (create/list/delete). Operator platform-wide reports (MRR, revenue by plan, top tenants, growth). Replaces the reports fixtures in both apps.

apps/portal/server/api/partner/reports/saved/[id].delete.ts

@@ -0,0 +1,23 @@
+// Delete a saved partner report. Forwards to platform-api
+// DELETE /me/partner/reports/saved/:id.
+import { getUserSession } from 'nuxt-oidc-auth/runtime/server/utils/session.js'
+
+export default defineEventHandler(async (event) => {
+  const session = await getUserSession(event).catch(() => null)
+  const accessToken = (session as { accessToken?: string } | null)?.accessToken
+  if (!accessToken) {
+    throw createError({ statusCode: 401, statusMessage: 'Not signed in' })
+  }
+
+  const id = getRouterParam(event, 'id')
+  const base = process.env.PLATFORM_API_INTERNAL_URL ?? 'http://platform-api:3001'
+  try {
+    return await $fetch(`${base}/me/partner/reports/saved/${id}`, {
+      method: 'DELETE',
+      headers: { Authorization: `Bearer ${accessToken}` },
+    })
+  } catch (err: unknown) {
+    const e = err as { statusCode?: number; data?: unknown }
+    throw createError({ statusCode: e.statusCode ?? 500, data: e.data })
+  }
+})