feat(analytics): account commission and investment transfers

Handle cashback commission imports, include commissions in analytics with separate investment metrics, and expose commission/version details in the UI.

Made-with: Cursor

backend/src/services/auth.ts

@@ -2,6 +2,7 @@ import { v4 as uuidv4 } from 'uuid';
 import { pool } from '../db/pool';
 import { config } from '../config';
 import type { LoginRequest, MeResponse } from '@family-budget/shared';
+import backendPackage from '../../package.json';
 
 export async function login(
   body: LoginRequest,
@@ -26,5 +27,8 @@ export async function logout(sessionId: string): Promise<void> {
 }
 
 export async function me(sessionId: string): Promise<MeResponse> {
-  return { login: config.appUserLogin };
+  return {
+    login: config.appUserLogin,
+    backendVersion: backendPackage.version,
+  };
 }