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/pkg/config/config.go

@@ -70,6 +70,10 @@ type Config struct {
 	TimewebAPIKey         string
 	TimewebProxySource    string
 
+	// Ollama (local LLM)
+	OllamaBaseURL   string
+	OllamaModelKey  string
+
 	// Timeouts
 	HTTPTimeout     time.Duration
 	LLMTimeout      time.Duration
@@ -141,6 +145,9 @@ func Load() (*Config, error) {
 		TimewebAPIKey:        getEnv("TIMEWEB_API_KEY", ""),
 		TimewebProxySource:   getEnv("TIMEWEB_X_PROXY_SOURCE", "gooseek"),
 
+		OllamaBaseURL:  getEnv("OLLAMA_BASE_URL", "http://ollama:11434"),
+		OllamaModelKey: getEnv("OLLAMA_MODEL", "llama3.2"),
+
 		HTTPTimeout:   time.Duration(getEnvInt("HTTP_TIMEOUT_MS", 60000)) * time.Millisecond,
 		LLMTimeout:    time.Duration(getEnvInt("LLM_TIMEOUT_MS", 120000)) * time.Millisecond,
 		ScrapeTimeout: time.Duration(getEnvInt("SCRAPE_TIMEOUT_MS", 25000)) * time.Millisecond,