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/Dockerfile.all

@@ -12,6 +12,7 @@ COPY . .
 
 # Build all services
 RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /bin/api-gateway ./cmd/api-gateway
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /bin/auth-svc ./cmd/auth-svc
 RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /bin/agent-svc ./cmd/agent-svc
 RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /bin/chat-svc ./cmd/chat-svc
 RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /bin/search-svc ./cmd/search-svc