Add dynamic memory-based asset caching and aggressive loading

- Add MemoryMonitor class for dynamic cache sizing based on available RAM
- Increase terrain load radius to 8 tiles (17x17 grid, 289 tiles)
- Scale worker threads to 75% of logical cores (no cap)
- Increase cache budget to 80% of available RAM, max file size to 50%
- Increase M2 render distance: 1200 units during taxi, 800 when >2000 instances
- Fix camera positioning during taxi flights (external follow mode)
- Add 2-second landing cooldown to prevent re-entering taxi mode on lag
- Update interval reduced to 33ms for faster streaming responsiveness

Optimized for high-memory systems while scaling gracefully to lower-end hardware.
Cache and render distances now fully utilize available VRAM on minimum spec GPUs.

include/core/memory_monitor.hpp

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+namespace wowee {
+namespace core {
+
+/**
+ * Monitors system memory and provides dynamic cache sizing
+ */
+class MemoryMonitor {
+public:
+    static MemoryMonitor& getInstance();
+
+    /**
+     * Initialize memory monitoring
+     */
+    void initialize();
+
+    /**
+     * Get total system RAM in bytes
+     */
+    size_t getTotalRAM() const { return totalRAM_; }
+
+    /**
+     * Get currently available RAM in bytes
+     */
+    size_t getAvailableRAM() const;
+
+    /**
+     * Get recommended cache budget (30% of available RAM)
+     */
+    size_t getRecommendedCacheBudget() const;
+
+    /**
+     * Check if system is under memory pressure
+     */
+    bool isMemoryPressure() const;
+
+private:
+    MemoryMonitor() = default;
+    size_t totalRAM_ = 0;
+};
+
+} // namespace core
+} // namespace wowee