feat(frontend): Vue 3 wizard UI (nostr login, episode upload, go-live)

- NIP-07 login → NIP-98 signed request → session cookie
- episode wizard: pick/create podcast (incl. lightning address question),
  browser-side sha256 + BUD-02 blossom upload with progress, feed result page
- live wizard + stream dashboard: OBS server/key (shown once, rotatable),
  browser WHIP publishing (camera or screen), hls.js live preview,
  publish-recording-as-episode flow
- settings view: external blossom URL, relay list, public URL (admin only)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/tailwind.config.js

@@ -0,0 +1,19 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ['./index.html', './src/**/*.{vue,ts}'],
+  theme: {
+    extend: {
+      colors: {
+        puddle: {
+          50: '#eef7ff',
+          100: '#d9edff',
+          500: '#2e90fa',
+          600: '#1570cd',
+          700: '#0f5aa8',
+          900: '#0b3866',
+        },
+      },
+    },
+  },
+  plugins: [],
+};