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/deploy/docker/docker-compose.yml

@@ -41,6 +41,7 @@ services:
       - LEARNING_SVC_URL=http://learning-svc:3034
       - ADMIN_SVC_URL=http://admin-svc:3040
       - JWT_SECRET=${JWT_SECRET}
+      - REDIS_URL=redis://redis:6379
     ports:
       - "3015:3015"
     depends_on:
@@ -49,6 +50,7 @@ services:
       - agent-svc
       - thread-svc
       - admin-svc
+      - redis
     networks:
       - gooseek