feat: 完整中文翻译 maths-cs-ai-compendium（数学·计算机科学·AI 知识大全）

翻译自英文原版 maths-cs-ai-compendium，共 20 章全部完成。

第01章 向量 | 第02章 矩阵 | 第03章 微积分
第04章 统计学 | 第05章 概率论 | 第06章 机器学习
第07章 计算语言学 | 第08章 计算机视觉 | 第09章 音频与语音
第10章 多模态学习 | 第11章 自主系统 | 第12章 图神经网络
第13章 计算与操作系统 | 第14章 数据结构与算法
第15章 生产级软件工程 | 第16章 SIMD与GPU编程
第17章 AI推理 | 第18章 ML系统设计
第19章 应用人工智能 | 第20章 前沿人工智能

翻译说明：
- 所有数学公式 $...$ / $$...$$、代码块、图片引用完整保留
- mkdocs.yml 配置中文导航 + language: zh
- README.md 已翻译为中文（兼 docs/index.md）
- docs/ 目录包含指向各章文件的 symlink
- 约 29,000 行中文内容，排除 .cache/ 构建缓存

images/fpn_pyramid.svg

@@ -0,0 +1,96 @@
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+  <defs>
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+      <polygon points="0 0, 7 2.5, 0 5" fill="#555"/>
+    </marker>
+    <marker id="fpn-arrow-green" markerWidth="7" markerHeight="5" refX="7" refY="2.5" orient="auto">
+      <polygon points="0 0, 7 2.5, 0 5" fill="#27ae60"/>
+    </marker>
+    <marker id="fpn-arrow-purple" markerWidth="7" markerHeight="5" refX="7" refY="2.5" orient="auto">
+      <polygon points="0 0, 7 2.5, 0 5" fill="#9b59b6"/>
+    </marker>
+  </defs>
+  <text x="350" y="22" fill="#333" font-size="14" font-weight="bold" text-anchor="middle">Feature Pyramid Network (FPN)</text>
+
+  <!-- Labels -->
+  <text x="120" y="48" fill="#3498db" font-size="11" font-weight="bold" text-anchor="middle">Bottom-Up</text>
+  <text x="120" y="62" fill="#3498db" font-size="9" text-anchor="middle">(backbone)</text>
+  <text x="350" y="48" fill="#9b59b6" font-size="11" font-weight="bold" text-anchor="middle">Lateral</text>
+  <text x="350" y="62" fill="#9b59b6" font-size="9" text-anchor="middle">(1×1 conv)</text>
+  <text x="530" y="48" fill="#27ae60" font-size="11" font-weight="bold" text-anchor="middle">Top-Down</text>
+  <text x="530" y="62" fill="#27ae60" font-size="9" text-anchor="middle">(+ upsample)</text>
+
+  <!-- Bottom-up pathway (left) -->
+  <!-- C2: large -->
+  <rect x="50" y="75" width="140" height="30" rx="3" fill="#3498db" opacity="0.12" stroke="#3498db" stroke-width="1.5"/>
+  <text x="120" y="95" fill="#3498db" font-size="9" text-anchor="middle" font-weight="bold">C2  (H/4 × W/4)</text>
+
+  <!-- Arrow down -->
+  <line x1="120" y1="105" x2="120" y2="125" stroke="#3498db" stroke-width="1.2" marker-end="url(#fpn-arrow)"/>
+
+  <!-- C3 -->
+  <rect x="65" y="130" width="110" height="30" rx="3" fill="#3498db" opacity="0.15" stroke="#3498db" stroke-width="1.5"/>
+  <text x="120" y="150" fill="#3498db" font-size="9" text-anchor="middle" font-weight="bold">C3  (H/8 × W/8)</text>
+
+  <!-- Arrow down -->
+  <line x1="120" y1="160" x2="120" y2="180" stroke="#3498db" stroke-width="1.2" marker-end="url(#fpn-arrow)"/>
+
+  <!-- C4 -->
+  <rect x="80" y="185" width="80" height="30" rx="3" fill="#3498db" opacity="0.18" stroke="#3498db" stroke-width="1.5"/>
+  <text x="120" y="205" fill="#3498db" font-size="9" text-anchor="middle" font-weight="bold">C4  (H/16)</text>
+
+  <!-- Arrow down -->
+  <line x1="120" y1="215" x2="120" y2="235" stroke="#3498db" stroke-width="1.2" marker-end="url(#fpn-arrow)"/>
+
+  <!-- C5 -->
+  <rect x="90" y="240" width="60" height="30" rx="3" fill="#3498db" opacity="0.22" stroke="#3498db" stroke-width="1.5"/>
+  <text x="120" y="260" fill="#3498db" font-size="9" text-anchor="middle" font-weight="bold">C5 (H/32)</text>
+
+  <!-- Lateral connections (1x1 conv arrows) -->
+  <line x1="190" y1="90" x2="380" y2="90" stroke="#9b59b6" stroke-width="1.2" stroke-dasharray="4,2" marker-end="url(#fpn-arrow-purple)"/>
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+
+  <!-- Top-down pathway + FPN outputs (right) -->
+  <!-- P5 -->
+  <rect x="460" y="240" width="60" height="30" rx="3" fill="#27ae60" opacity="0.15" stroke="#27ae60" stroke-width="1.5"/>
+  <text x="490" y="260" fill="#27ae60" font-size="9" text-anchor="middle" font-weight="bold">P5</text>
+
+  <!-- Merge node + P4 -->
+  <circle cx="420" y="200" r="8" fill="#fff" stroke="#f39c12" stroke-width="1.5"/>
+  <text x="420" y="204" fill="#f39c12" font-size="10" text-anchor="middle" font-weight="bold">+</text>
+  <line x1="490" y1="240" x2="420" y2="210" stroke="#27ae60" stroke-width="1.2" marker-end="url(#fpn-arrow-green)"/>
+  <text x="465" y="228" fill="#27ae60" font-size="7" text-anchor="middle">2× up</text>
+  <line x1="430" y1="200" x2="458" y2="200" stroke="#555" stroke-width="1.2" marker-end="url(#fpn-arrow)"/>
+  <rect x="460" y="185" width="80" height="30" rx="3" fill="#27ae60" opacity="0.15" stroke="#27ae60" stroke-width="1.5"/>
+  <text x="500" y="205" fill="#27ae60" font-size="9" text-anchor="middle" font-weight="bold">P4</text>
+
+  <!-- Merge node + P3 -->
+  <circle cx="420" y="145" r="8" fill="#fff" stroke="#f39c12" stroke-width="1.5"/>
+  <text x="420" y="149" fill="#f39c12" font-size="10" text-anchor="middle" font-weight="bold">+</text>
+  <line x1="490" y1="185" x2="420" y2="155" stroke="#27ae60" stroke-width="1.2" marker-end="url(#fpn-arrow-green)"/>
+  <text x="465" y="173" fill="#27ae60" font-size="7" text-anchor="middle">2× up</text>
+  <line x1="430" y1="145" x2="458" y2="145" stroke="#555" stroke-width="1.2" marker-end="url(#fpn-arrow)"/>
+  <rect x="460" y="130" width="110" height="30" rx="3" fill="#27ae60" opacity="0.15" stroke="#27ae60" stroke-width="1.5"/>
+  <text x="515" y="150" fill="#27ae60" font-size="9" text-anchor="middle" font-weight="bold">P3</text>
+
+  <!-- Merge node + P2 -->
+  <circle cx="420" y="90" r="8" fill="#fff" stroke="#f39c12" stroke-width="1.5"/>
+  <text x="420" y="94" fill="#f39c12" font-size="10" text-anchor="middle" font-weight="bold">+</text>
+  <line x1="500" y1="130" x2="420" y2="100" stroke="#27ae60" stroke-width="1.2" marker-end="url(#fpn-arrow-green)"/>
+  <text x="470" y="118" fill="#27ae60" font-size="7" text-anchor="middle">2× up</text>
+  <line x1="430" y1="90" x2="458" y2="90" stroke="#555" stroke-width="1.2" marker-end="url(#fpn-arrow)"/>
+  <rect x="460" y="75" width="140" height="30" rx="3" fill="#27ae60" opacity="0.15" stroke="#27ae60" stroke-width="1.5"/>
+  <text x="530" y="95" fill="#27ae60" font-size="9" text-anchor="middle" font-weight="bold">P2</text>
+
+  <!-- Detection labels on right -->
+  <text x="635" y="95" fill="#666" font-size="8" text-anchor="start">← small objects</text>
+  <text x="605" y="150" fill="#666" font-size="8" text-anchor="start">← medium</text>
+  <text x="575" y="205" fill="#666" font-size="8" text-anchor="start">← medium</text>
+  <text x="535" y="260" fill="#666" font-size="8" text-anchor="start">← large objects</text>
+
+  <!-- Bottom note -->
+  <rect x="100" y="278" width="500" height="18" rx="4" fill="#f5f5f5" stroke="#333" stroke-width="1"/>
+  <text x="350" y="291" fill="#666" font-size="9" text-anchor="middle">Each pyramid level has strong semantics (from top-down path) and good spatial resolution (from bottom-up).</text>
+</svg>