feat: Convertir BOIDS a sistema time-based (independiente de framerate)

- Conversión completa de físicas BOIDS de frame-based a time-based
- Velocidades: ×60 (px/frame → px/s)
- Aceleraciones (Separation, Cohesion): ×3600 (px/frame² → px/s²)
- Steering proporcional (Alignment): ×60
- Límites de velocidad: ×60

Constantes actualizadas en defines.h:
- BOID_SEPARATION_WEIGHT: 1.5 → 5400.0 (aceleración)
- BOID_COHESION_WEIGHT: 0.001 → 3.6 (aceleración)
- BOID_ALIGNMENT_WEIGHT: 1.0 → 60.0 (steering)
- BOID_MAX_SPEED: 2.5 → 150.0 px/s
- BOID_MIN_SPEED: 0.3 → 18.0 px/s
- BOID_MAX_FORCE: 0.05 → 3.0 px/s

Física ahora consistente en 60Hz, 144Hz, 240Hz screens.
Transiciones BOIDS↔PHYSICS preservan velocidad correctamente.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

source/ui/ui_manager.cpp

@@ -277,6 +277,27 @@ void UIManager::renderDebugHUD(const Engine* engine,
     text_renderer_debug_->printAbsolute(margin, left_y, simmode_text.c_str(), {0, 255, 255, 255});  // Cian
     left_y += line_height;
 
+    // Número de pelotas (escenario actual)
+    size_t ball_count = scene_manager->getBallCount();
+    std::string balls_text;
+    if (ball_count >= 1000) {
+        // Formatear con separador de miles (ejemplo: 5,000 o 50,000)
+        std::string count_str = std::to_string(ball_count);
+        std::string formatted;
+        int digits = count_str.length();
+        for (int i = 0; i < digits; i++) {
+            if (i > 0 && (digits - i) % 3 == 0) {
+                formatted += ',';
+            }
+            formatted += count_str[i];
+        }
+        balls_text = "Balls: " + formatted;
+    } else {
+        balls_text = "Balls: " + std::to_string(ball_count);
+    }
+    text_renderer_debug_->printAbsolute(margin, left_y, balls_text.c_str(), {128, 255, 128, 255});  // Verde claro
+    left_y += line_height;
+
     // V-Sync
     text_renderer_debug_->printAbsolute(margin, left_y, vsync_text_.c_str(), {0, 255, 255, 255});  // Cian
     left_y += line_height;