feat(video_core): implement comprehensive VRAM management system

Add automatic VRAM leak prevention with configurable garbage collection
to prevent device loss crashes during extended play sessions.

New Settings:
- vram_limit_mb: Configurable VRAM limit (0 = auto-detect 80%)
- gc_aggressiveness: Off/Light/Moderate/Heavy/Extreme levels
- texture_eviction_frames: Frames before texture eviction (default 2)
- buffer_eviction_frames: Frames before buffer eviction (default 5)
- sparse_texture_priority_eviction: Prioritize large sparse textures
- log_vram_usage: Enable VRAM statistics logging

Core Changes:
- Enhanced texture cache with LRU eviction and sparse texture priority
- Enhanced buffer cache with configurable eviction thresholds
- Added VRAM pressure monitoring using VK_EXT_memory_budget
- Emergency GC triggers at 90%/95% VRAM usage thresholds

Platform Support:
- Desktop: Settings in Graphics > Advanced tab
- Android: Settings in Zep Zone category

Fixes VRAM climbing steadily during gameplay until device loss.
Target: Stable VRAM usage below configured limit for 2+ hours.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/common/settings_enums.h

@@ -880,6 +880,32 @@ inline u32 EnumMetadata<ExtendedDynamicState>::Index() {
     return 26;
 }
 
+// FIXED: VRAM leak prevention - GC aggressiveness levels
+enum class GCAggressiveness : u32 {
+    Off = 0,        // Disable automatic GC (not recommended)
+    Light = 1,      // Light GC - only evict very old textures
+    Moderate = 2,   // Moderate GC - balanced eviction (default)
+    Heavy = 3,      // Heavy GC - aggressive eviction for low VRAM systems
+    Extreme = 4,    // Extreme GC - maximum eviction for 4GB VRAM systems
+};
+
+template <>
+inline std::vector<std::pair<std::string, GCAggressiveness>>
+EnumMetadata<GCAggressiveness>::Canonicalizations() {
+    return {
+        {"Off", GCAggressiveness::Off},
+        {"Light", GCAggressiveness::Light},
+        {"Moderate", GCAggressiveness::Moderate},
+        {"Heavy", GCAggressiveness::Heavy},
+        {"Extreme", GCAggressiveness::Extreme},
+    };
+}
+
+template <>
+inline u32 EnumMetadata<GCAggressiveness>::Index() {
+    return 27;
+}
+
 
 template <typename Type>
 inline std::string CanonicalizeEnum(Type id) {