build: move local development off port 3000

Run the dev API on 6262 and Vite on 6263 with strictPort; production
defaults stay on 3000. Define the dev client origin once and read the
typed appConfig instead of repeating its fallback in every gateway.

client/README.md

@@ -6,9 +6,9 @@ Vue 3 SPA built with Vite and Tailwind CSS v4.
 
 From the repo root: `pnpm dev` (starts both server and client).
 
-Client only: `pnpm dev` (from this directory). Runs at http://localhost:5173.
+Client only: `pnpm dev` (from this directory). Runs at http://localhost:6263.
 
-The Vite dev server proxies `/api` and `/socket.io` requests to the backend at `localhost:3000`.
+The Vite dev server proxies `/api` and `/socket.io` requests to the backend at `localhost:6262`.
 
 ## IDE setup
 

client/vite.config.ts

@@ -9,7 +9,7 @@ import { VitePWA } from 'vite-plugin-pwa'
 
 const apiAgent = new Agent({ keepAlive: true })
 /** Lets a second dev client point at a throwaway API instance, so restart testing leaves the main stack alone. */
-const apiTarget = process.env.BOOKORBIT_API_TARGET ?? 'http://localhost:3000'
+const apiTarget = process.env.BOOKORBIT_API_TARGET ?? 'http://localhost:6262'
 
 // https://vite.dev/config/
 export default defineConfig({
@@ -141,6 +141,8 @@ export default defineConfig({
     exclude: ['@embedpdf/core', '@embedpdf/core/vue'],
   },
   server: {
+    port: 6263,
+    strictPort: true,
     host: true,
     allowedHosts: true,
     proxy: {