perf(render): batch model rendering with instancing

Replaces per-entity draw calls with instanced rendering for both main and shadow passes. Each model's node hierarchy is flattened once and instance matrices are updated per frame, reducing draw calls and CPU overhead.

assets/shaders/depth_model_instance_vert.glsl

@@ -0,0 +1,13 @@
+#version 460
+
+layout (location = 0) in vec3 pos;
+layout (location = 1) in vec2 texCoord;
+layout (location = 3) in mat4 modelMatrix;
+uniform mat4 lightSpaceMatrix;
+
+out vec2 tc;
+
+void main() {
+    tc = texCoord;
+    gl_Position = lightSpaceMatrix * modelMatrix * vec4(pos, 1.0);
+}

assets/shaders/depth_model_vert copy.glsl

@@ -0,0 +1,14 @@
+#version 460
+
+layout (location = 0) in vec3 pos;
+layout (location = 1) in vec2 texCoord;
+
+uniform mat4 lightSpaceMatrix;
+uniform mat4 modelMatrix;
+
+out vec2 tc;
+
+void main() {
+    tc = texCoord;
+    gl_Position = lightSpaceMatrix * modelMatrix * vec4(pos, 1.0);
+}

assets/shaders/model_instance_vert.glsl

@@ -0,0 +1,26 @@
+#version 460
+
+layout (location = 0) in vec3 pos;
+layout (location = 1) in vec2 texCoord;
+layout (location = 2) in vec3 aNormal;
+layout (location = 3) in mat4 modelMatrix;
+uniform mat4 view_matrix;
+uniform mat4 proj_matrix;
+uniform mat4 lightSpaceMatrix;
+out vec4 FragPosLightSpace;
+out vec3 normal;
+out vec2 tc;
+out vec3 vert_pos;
+
+
+void main() {
+    vec4 worldPos = modelMatrix * vec4(pos, 1.0);
+    FragPosLightSpace = lightSpaceMatrix * worldPos;
+    mat4 mv_matrix= view_matrix *  modelMatrix;
+    mat4 norm_matrix = transpose(inverse(mv_matrix)); 
+    vec4 viewPos = mv_matrix * vec4(pos, 1.0);
+    tc = texCoord;
+    vert_pos = pos;
+    normal = normalize(mat3(norm_matrix) * aNormal);
+    gl_Position = proj_matrix * viewPos;
+}