feat: add RelationInsight API and wire H5 relation/profile pages

Second P1 growth engine: compare two profiles, gate full tips behind
deep-access mock payment, and list personal archives on /profile.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/sdk/src/index.ts

@@ -65,6 +65,14 @@ export function createClient(opts: CreateClientOptions) {
       call<{ order_id: string }>('/api/v1/orders', { method: 'POST', body }),
     payMock: (orderId: string) =>
       call<{ paid: boolean }>(`/api/v1/orders/${orderId}/pay-mock`, { method: 'POST' }),
+    createRelationInsight: (profile_a_id: string, profile_b_id: string) =>
+      call<{
+        insight: { id: string; report_id?: string }
+        report: GrowthReport
+      }>('/api/v1/relation/insight', {
+        method: 'POST',
+        body: { profile_a_id, profile_b_id },
+      }),
   }
 }