feat: structure view in dashboard and settings persistence

- Add GET /api/claude/sessions/{session_id}/builder API for structure view
- Load builder session tags and snippets by Claude session ID
- Implement structure view in dashboard: shows tag selections and snippet details
- Add LoadSettings to persist LLM config changes across restarts
- Settings are now loaded from database on startup

Co-Authored-By: Claude <noreply@anthropic.com>

main.go

@@ -41,6 +41,9 @@ func main() {
 	// Ensure prompts table exists for dev environments
 	db.EnsurePromptsTable()
 
+	// Load persisted settings from database
+	db.LoadSettings(cfg)
+
 	// Setup routes
 	mux := http.NewServeMux()
 
@@ -89,6 +92,7 @@ func main() {
 
 	apiMux.HandleFunc("GET /api/claude/sessions", handlers.GetClaudeSessions)
 	apiMux.HandleFunc("GET /api/claude/sessions/{session_id}/prompts", handlers.GetClaudePrompts)
+	apiMux.HandleFunc("GET /api/claude/sessions/{session_id}/builder", handlers.GetBuilderSessionByClaudeSession)
 
 	apiMux.HandleFunc("GET /api/dashboard/projects", handlers.GetDashboardProjects)
 	apiMux.HandleFunc("GET /api/dashboard/projects/{name}/sessions", handlers.GetDashboardSessions)