Add animation controller system, material assets and skeleton visualization

- .animctrl state machine asset (params/transitions/blend trees, 1D+2D
  directional blending) with Unity Animator-style editor panel: state
  list, transitions, params, directional pad preview driving live
  CrossFade on the selected entity
- Split animation evaluation out of SceneRenderer into
  AnimationSystem/AnimationEvaluator; skin palettes with rest-pose
  fallback and blend-weight epsilon filtering
- MaterialAsset (.material) with reload-safe preview tile pool
  (DropMaterial clears dirty refs before instance destruction)
- EditorGizmoPass skeleton wires + viewport joint overlay; camera
  projection rework (baked Vulkan Y-flip, ortho support)
- Editor/game build split via HELLOVULKAN_EDITOR option

shaders/simple_shader.frag

@@ -44,8 +44,21 @@ layout(set = 1, binding = 5) uniform sampler2D roughnessMap;  // 独立粗糙度
 layout(set = 1, binding = 6) uniform MaterialParams {
     vec4 factors;     // x = metallic 因子，y = roughness 因子，z = 独立粗糙度图开关，w = MASK 镂空开关
     vec4 baseColor;   // glTF baseColorFactor：rgb 调色 albedo，a = BLEND 透明度
+    vec4 surface;     // x = ior（F0 换算），y = transmission（不透明段恒 0 语义），z = 自发光强度，w = 体积厚度
+    vec4 misc;        // x = unlit（KHR_materials_unlit，1 = 早退直出 albedo）
+    vec4 uvA[6];      // 每槽 UV 线性变换（KHR_texture_transform，v-up 空间）(a11,a12,a21,a22)，槽序 = binding
+    vec4 uvT[6];      // 每槽 UV 平移 (tx, ty, 0, 0)
 } matParams;
 
+// 每槽 UV 变换：uv' = A·uv + t（identity 时退化为直通）。slot 必须
+// 字面量调用点（编译期展开索引）；6 = Material::kSlotCount
+vec2 ApplyUv(int slot, vec2 uv) {
+    vec4 a = matParams.uvA[slot];
+    vec4 t = matParams.uvT[slot];
+    return vec2(a.x * uv.x + a.y * uv.y + t.x,
+                a.z * uv.x + a.w * uv.y + t.y);
+}
+
 // CSM 阴影（sampler2DShadow：单次采样 = 硬件 2×2 深度比较 PCF）
 layout(set = 2, binding = 0) uniform sampler2DShadow shadowMap0;   // CSM 级联 0（最近）
 layout(set = 2, binding = 1) uniform sampler2DShadow shadowMap1;   // 级联 1
@@ -136,23 +149,40 @@ vec3 FresnelSchlickRoughness(float cosTheta, vec3 F0, float roughness) {
 }
 
 void main() {
-    vec4 albedoTex = texture(albedoMap, fragUV);
+    vec4 albedoTex = texture(albedoMap, ApplyUv(0, fragUV));
     // alphaMode=MASK 镂空（表针/栅栏等硬边贴图）：低于阈值的纹素直接丢弃
     if (matParams.factors.w > 0.5 && albedoTex.a < 0.5) discard;
     vec3 albedo = albedoTex.rgb * matParams.baseColor.rgb;
-    vec4 mr = texture(metallicRoughnessMap, fragUV);
+    // KHR_materials_unlit：无光照语义（文字标签/示意图），albedo 直出
+    if (matParams.misc.x > 0.5) {
+        outColor = vec4(albedo, albedoTex.a * matParams.baseColor.a);
+        outVelocity = fragVelocity;
+        return;
+    }
+    vec4 mr = texture(metallicRoughnessMap, ApplyUv(2, fragUV));
     // 粗糙度源按 factors.z 切换：glTF 合图工作流读 MR.g；
     // FBX/OBJ specular 工作流（z=1）换用独立粗糙度图 R 通道
-    float roughness = clamp(mix(mr.g, texture(roughnessMap, fragUV).r,
+    float roughness = clamp(mix(mr.g, texture(roughnessMap, ApplyUv(5, fragUV)).r,
                                 matParams.factors.z) * matParams.factors.y,
                             0.045, 1.0);
     float metallic  = clamp(mr.b * matParams.factors.x, 0.0, 1.0);
-    vec3 emissive = texture(emissiveMap, fragUV).rgb;
+    // 自发光强度（KHR_materials_emissive_strength，缺省 1）
+    vec3 emissive = texture(emissiveMap, ApplyUv(3, fragUV)).rgb * matParams.surface.z;
 
-    vec3 N = MappedNormal(normalize(fragNormal), fragTangent, fragUV);
+    vec3 N = MappedNormal(normalize(fragNormal), fragTangent, ApplyUv(1, fragUV));
     vec3 V = normalize(ubo.cameraPos.xyz - fragWorldPos);
+    // 双面法线：cull 关闭 + glTF doubleSided=true，背面片元（表壳后盖/
+    // 内壁等从背面看到的表面）几何法线背向相机，NdotL≤0 → 直接光全灭、
+    // IBL 采错半球 = 纯黑壳（three.js DoubleSide 对背面自动翻法线，
+    // 这里对齐该语义；与 translucent shader 的翻转同款）
+    if (dot(N, V) < 0.0) N = -N;
     float NdotV = max(dot(N, V), 1e-4);
-    vec3 F0 = mix(vec3(0.04), albedo, metallic);   // 电介质基准反射率 4%
+    // F0 按折射率换算（KHR_materials_ior）：((ior-1)/(ior+1))²；
+    // glTF 缺省 ior=1.5 → 0.04，与旧固定值一致
+    float ior = max(matParams.surface.x, 1.0);
+    vec3 F0 = mix(vec3((ior - 1.0) / (ior + 1.0)
+                       * (ior - 1.0) / (ior + 1.0)),
+                  albedo, metallic);   // 电介质 F0 / 金属 albedo
 
     vec3 Lo = vec3(0.0);
     float shade0 = 1.0f;   // 第 0 盏光的阴影因子（环境光同步衰减用）
@@ -213,7 +243,7 @@ void main() {
     vec3 kD_amb = (1.0 - F_amb) * (1.0 - metallic);
 
     vec3 irradiance = texture(irradianceMap, N).rgb;
-    float ao = texture(aoMap, fragUV).r;
+    float ao = texture(aoMap, ApplyUv(4, fragUV)).r;
     vec3 diffuse = kD_amb * irradiance * albedo * ao;
 
     vec3 R = reflect(-V, N);
@@ -229,5 +259,7 @@ void main() {
     // alpha = albedo 贴图覆盖率 × baseColorFactor.a（glTF alphaMode=BLEND
     // 混合源）；不透明资产两者恒 1 行为不变。预乘在 tonemap 段完成。
     outColor = vec4(ambient + Lo + emissive, albedoTex.a * matParams.baseColor.a);
+    // ==== DEBUG B1: 纯 albedo 直出（验证贴图绑定/UV 采样）====
+    // outColor = vec4(albedo, 1.0);
     outVelocity = fragVelocity;
 }