video(cpp11/00): manim animation for auto/decltype

[Sunrisepeak]

Overview

Adds the Manim animation for chapter 00 (book/src/cpp11/00-auto-and-decltype.md), following the existing videos/cpp11/* framework.

Implementation

• MovingCameraScene + the shared videos/d2x framework (mcpp_video_start/end, DHighlight, create_code_helper) — same conventions as 09/10/11.
• Six scenes tracking the chapter:
  1. 声明定义 — auto deduces from initializer / decltype takes the declared type
  2. 表达式类型推导 — precision preserved
  3. 复杂类型推导 — auto tames the verbose iterator type (STL real-world angle)
  4. 函数返回值推导 — trailing return auto … -> decltype(a + b)
  5. const / 引用剥离 — auto strips top-level const/ref; const auto& / decltype preserve
  6. decltype 括号陷阱 — decltype(a) vs decltype((a))

Run (uv)

uv run --with "manim==0.18.1" manim -pql videos/cpp11/00-auto-and-decltype.py

Notes

• Syntax validated; uses only Manim/d2x APIs already proven by the existing rendering videos.
• A full headless render could not be completed in the sandbox: the system cairo (1.18) is built with XCB support, so pycairo must compile its XCB binding, but the full libxcb*-dev headers (xcb/render.h, xcb/shm.h) aren't present and sudo apt isn't available. On a normal dev box with manim installed this renders like the other chapters.