feat: spaces redesign, model selector, auth fixes

Spaces:
- Perplexity-like UI with collaboration features
- Space detail page with threads/members tabs
- Invite members via email, role management
- New space creation with icon/color picker

Model selector:
- Added Ollama client for free Auto model
- GooSeek 1.0 via Timeweb (tariff-based)
- Frontend model dropdown in ChatInput

Auth & Infrastructure:
- Fixed auth-svc missing from Dockerfile.all
- Removed duplicate ratelimit_tiered.go (conflict)
- Added Redis to api-gateway for rate limiting
- Fixed Next.js proxy for local development

UI improvements:
- Redesigned login button in sidebar (gradient)
- Settings page with tabs (account/billing/prefs)
- Auth pages visual refresh

Made-with: Cursor

backend/webui/next.config.mjs

@@ -3,13 +3,14 @@ const nextConfig = {
   output: 'standalone',
   reactStrictMode: true,
   env: {
-    API_URL: process.env.API_URL || 'http://api-gateway:3015',
+    API_URL: process.env.API_URL || 'http://localhost:3015',
   },
   async rewrites() {
+    const apiUrl = process.env.API_URL || 'http://localhost:3015';
     return [
       {
         source: '/api/:path*',
-        destination: `${process.env.API_URL || 'http://api-gateway:3015'}/api/:path*`,
+        destination: `${apiUrl}/api/:path*`,
       },
     ];
   },