fix(e2e): read ports from project config instead of hardcoding #3775

Problem

E2E tests hardcode localhost:3000 (API) and localhost:8080 (Vue) in three places:

• playwright.config.js — baseURL and webServer port
• src/lib/helpers/e2e/auth.js — signup/signin API calls
• src/lib/helpers/e2e/api.js — const API = 'http://localhost:3000/api'

The project config system (generateConfig.js) already supports per-project ports via NODE_ENV={project} configs (e.g. Lou uses 3010/8010), but E2E files don't read from it.

This causes all downstream project E2E tests to fail locally since they run on different ports.

Expected behavior

• playwright.config.js should run generateConfig then import the generated config to read port and api.port
• E2E helpers should build API URLs from the config (api.protocol, api.host, api.port, api.base)
• Running NODE_ENV=lou npx playwright test should work on ports 3010/8010 automatically

Files

• playwright.config.js
• src/lib/helpers/e2e/auth.js
• src/lib/helpers/e2e/api.js