Phase 5: Remove dashboard code from crawler

Removed dashboard-related files (now in standalone dashboard/ service):
- api_domains.go, api_feeds.go, api_publish.go, api_search.go
- dashboard.go, templates.go
- oauth.go, oauth_handlers.go, oauth_middleware.go, oauth_session.go
- routes.go
- static/dashboard.css, static/dashboard.js

Updated crawler.go:
- Removed cachedStats, cachedAllDomains, statsMu fields
- Removed StartStatsLoop function

Updated main.go:
- Removed dashboard startup
- Removed stats loop and UpdateStats calls

The crawler now runs independently without dashboard.
Use the standalone dashboard/ service for web interface.

main.go

@@ -19,16 +19,6 @@ func main() {
 	sigChan := make(chan os.Signal, 1)
 	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
 
-	// Start dashboard in background
-	go func() {
-		if err := crawler.StartDashboard("0.0.0.0:4321"); err != nil {
-			fmt.Fprintf(os.Stderr, "Dashboard error: %v\n", err)
-		}
-	}()
-
-	// Initialize stats in background (can be slow with large DBs)
-	go crawler.UpdateStats()
-
 	// Start all loops independently
 	fmt.Println("Starting import and processing loops...")
 
@@ -44,9 +34,6 @@ func main() {
 	// feed_check loop (background) - checks feeds for new items
 	go crawler.StartFeedCheckLoop()
 
-	// Stats loop (background) - updates once per minute
-	go crawler.StartStatsLoop()
-
 	// Cleanup loop (background) - removes old items once per week
 	go crawler.StartCleanupLoop()