fix: .gitignore + add 44 language JSON files

Engine/Terrain/terrain_manager.h

@@ -0,0 +1,42 @@
+#pragma once
+
+// ============================================================================
+// terrain_manager.h - 地形分块流式加载
+// ============================================================================
+
+#include "terrain.h"
+#include "../Rendering/material.h"
+#include "../Rendering/renderer.h"
+#include "../ASM/math_c_fallback.h"
+
+#define TERRAIN_MAX_CHUNKS 64
+
+typedef struct {
+    int cx;
+    int cz;
+    Terrain* terrain;
+    Material* material;
+    int loaded;
+} TerrainChunk;
+
+typedef struct {
+    TerrainConfig config;
+    TerrainChunk chunks[TERRAIN_MAX_CHUNKS];
+    int chunk_count;
+    int load_radius;
+    int seed;
+    ID3D11Device* device;
+    Material* base_material;
+} TerrainManager;
+
+TerrainManager* terrain_manager_create(ID3D11Device* dev, const TerrainConfig* config, Material* base_material);
+void terrain_manager_destroy(TerrainManager* tm);
+
+// 根据观察者位置更新分块
+void terrain_manager_update(TerrainManager* tm, Vec3 observer_pos);
+
+// 渲染所有已加载分块
+void terrain_manager_render(TerrainManager* tm, Renderer* renderer);
+
+// 从世界坐标获取地形高度（在所有已加载分块中采样）
+float terrain_manager_get_height(TerrainManager* tm, float world_x, float world_z);