feat: 积分流水互转合并展示，并优化个人主页与经济看板

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

frontend/lib/api.ts

@@ -971,6 +971,13 @@ export async function apiGetPoints(): Promise<{ points: number }> {
   return res.json();
 }
 
+export interface LedgerParty {
+  id: number;
+  username: string;
+  nickname: string;
+  avatar: string;
+}
+
 export interface PointLedgerItem {
   id: number;
   delta: number;
@@ -980,6 +987,9 @@ export interface PointLedgerItem {
   ref_id: number;
   note: string;
   created_at: string;
+  user?: LedgerParty;
+  from?: LedgerParty;
+  to?: LedgerParty;
 }
 
 export async function apiGetPointsLedger(