feat: add standalone marketplace PWA build

Adds a standalone Nostr marketplace PWA at market.${domain}, built
from the existing src/modules/market plugin. Same standalone pattern
as wallet/chat/castle/activities:
- market.html entry, vite.market.config.ts (outDir: dist-market,
  manifest id: market-app, theme: red #dc2626 — Muladhara chakra)
- src/market-app/{main.ts, app.ts, app.config.ts, App.vue} bootstraps
  base + market only, with acceptTokenFromUrl for shared auth from hub
- npm run dev:market / build:market / preview:market
- main app SW denylist extended with /market/, /cart/, /checkout/

Closes #18.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vite.config.ts

@@ -25,7 +25,7 @@ export default defineConfig(({ mode }) => ({
           '**/*.{js,css,html,ico,png,svg}'
         ],
         // Don't intercept standalone app paths — they have their own service workers
-        navigateFallbackDenylist: [/^\/sortir\//, /^\/castle\//],
+        navigateFallbackDenylist: [/^\/sortir\//, /^\/castle\//, /^\/market\//, /^\/cart\//, /^\/checkout\//],
       },
       includeAssets: [
         'favicon.ico',