feat(tools): 白模关卡自动生成Python脚本——Level Builder

两阶段流水线：搭建指南Markdown → JSON → UE5 Actor
- 解析器：4种表格变体+范围展开+坐标表达式计算
- 配置：37种BSP资产映射+13种材质+7区域定义
- 验证：265个Actor全部通过，0错误
- Builder：UE5 Python API自动放置Actor+材质+Outliner
- 报告：自动生成搭建报告Markdown

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/level-builder/config/material_mapping.py

@@ -0,0 +1,25 @@
+"""标识色材质路径映射。
+
+数据来源: docs/technical/关卡-v01-搭建指南.md §1.13
+"""
+
+MATERIAL_PATHS = {
+    # ---- Basics（标识色） ----
+    "MI_DevRed":     "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevRed.MI_DevRed",
+    "MI_DevOrange":  "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevOrange.MI_DevOrange",
+    "MI_DevGray":    "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevGray.MI_DevGray",
+    "MI_DevBrown":   "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevBrown.MI_DevBrown",
+    "MI_DevWhite":   "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevWhite.MI_DevWhite",
+    "MI_DevBlue":    "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevBlue.MI_DevBlue",
+    "MI_DevGreen":   "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevGreen.MI_DevGreen",
+    "MI_DevSkyBlue": "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevSkyBlue.MI_DevSkyBlue",
+    "MI_DevYellow":  "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevYellow.MI_DevYellow",
+    "MI_DevFoliage": "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevFoliage.MI_DevFoliage",
+    "MI_DevPink":    "/Game/BlockingStarterPack/Materials/Blocking/Basics/MI_DevPink.MI_DevPink",
+    # ---- Glass ----
+    "MI_DevGlassWhite": "/Game/BlockingStarterPack/Materials/Glass/MI_DevGlassWhite.MI_DevGlassWhite",
+    "MI_DevGlassBlue":  "/Game/BlockingStarterPack/Materials/Glass/MI_DevGlassBlue.MI_DevGlassBlue",
+}
+
+# 材质在 Content/ 目录下的文件系统路径前缀（用于离线文件存在性验证）
+MATERIAL_FS_PREFIX = "Content/BlockingStarterPack/Materials"