stubbed rank implementation

ui/src/api/rank.ts

@@ -0,0 +1,33 @@
+export type Member = { id: number; name: string }
+export type Rank = { id: number; name: string }
+
+// Placeholder: fetch list of members
+export async function getMembers(): Promise<Member[]> {
+  // Simulate async delay
+  await new Promise((r) => setTimeout(r, 150))
+  return [
+    { id: 1, name: 'Alice Anderson' },
+    { id: 2, name: 'Bob Brown' },
+    { id: 3, name: 'Charlie Clark' },
+    { id: 4, name: 'Dana Diaz' },
+  ]
+}
+
+// Placeholder: fetch list of ranks
+export async function getRanks(): Promise<Rank[]> {
+  await new Promise((r) => setTimeout(r, 120))
+  return [
+    { id: 10, name: 'Private' },
+    { id: 20, name: 'Corporal' },
+    { id: 30, name: 'Sergeant' },
+    { id: 40, name: 'Lieutenant' },
+    { id: 50, name: 'Captain' },
+  ]
+}
+
+// Placeholder: submit a rank change
+export async function submitRankChange(memberId: number, rankId: number): Promise<{ ok: boolean }> {
+  console.log('Stub submitRankChange', { memberId, rankId })
+  await new Promise((r) => setTimeout(r, 200))
+  return { ok: true }
+}