Quadruple all HTTP timeouts to prevent timeout errors

- HTTP request timeout: 2s -> 8s
- Stats collection context timeout: 1s -> 4s
- HTTP read header timeout: 10s -> 40s

This should prevent timeout errors when the database is under load
or when complex queries take longer than expected (slow query
threshold is 50ms).

internal/server/handlers.go

@@ -80,8 +80,8 @@ func (s *Server) handleStatusJSON() http.HandlerFunc {
 	}
 
 	return func(w http.ResponseWriter, r *http.Request) {
-		// Create a 1 second timeout context for this request
-		ctx, cancel := context.WithTimeout(r.Context(), 1*time.Second)
+		// Create a 4 second timeout context for this request
+		ctx, cancel := context.WithTimeout(r.Context(), 4*time.Second)
 		defer cancel()
 
 		metrics := s.streamer.GetMetrics()
@@ -214,8 +214,8 @@ func (s *Server) handleStats() http.HandlerFunc {
 	}
 
 	return func(w http.ResponseWriter, r *http.Request) {
-		// Create a 1 second timeout context for this request
-		ctx, cancel := context.WithTimeout(r.Context(), 1*time.Second)
+		// Create a 4 second timeout context for this request
+		ctx, cancel := context.WithTimeout(r.Context(), 4*time.Second)
 		defer cancel()
 
 		// Check if context is already cancelled