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/cmd/agent-svc/main.go

@@ -93,15 +93,23 @@ func main() {
 			providerID = "timeweb"
 			modelKey = "gpt-4o"
 		} else if providerID == "" {
-			providerID = "openai"
-			modelKey = "gpt-4o-mini"
+			providerID = "ollama"
+			modelKey = cfg.OllamaModelKey
+		}
+
+		baseURL := cfg.TimewebAPIBaseURL
+		if providerID == "ollama" {
+			baseURL = cfg.OllamaBaseURL
+			if modelKey == "" {
+				modelKey = cfg.OllamaModelKey
+			}
 		}
 
 		llmClient, err := llm.NewClient(llm.ProviderConfig{
 			ProviderID:    providerID,
 			ModelKey:      modelKey,
 			APIKey:        getAPIKey(cfg, providerID),
-			BaseURL:       cfg.TimewebAPIBaseURL,
+			BaseURL:       baseURL,
 			AgentAccessID: cfg.TimewebAgentAccessID,
 		})
 		if err != nil {
@@ -200,6 +208,8 @@ func main() {
 
 func getAPIKey(cfg *config.Config, providerID string) string {
 	switch providerID {
+	case "ollama":
+		return ""
 	case "timeweb":
 		return cfg.TimewebAPIKey
 	case "openai":