Add bilingual blog posts on Pod startup optimization for general and AI workloads

[Copilot]

Creates two blog posts based on existing Pod startup documentation: one covering general Kubernetes Pod optimization, another focused on GPU Pod cold start challenges in AI/ML scenarios.

Content Structure

General Pod Startup Optimization (pod-startup-speed*.md)

• Four-stage optimization framework: API Server, scheduling, node startup, observability
• Practical techniques: image optimization, parallel pulls, CPU management, probe tuning
• Advanced patterns: Forensic Container Checkpointing, gVisor snapshots for Agent workloads

AI/GPU Pod Cold Start Optimization (gpu-pod-startup-ai*.md)

• Three primary solutions: pre-warmed pools, serialization format optimization, lazy loading
• Model format comparison: PyTorch pickle (12s) → TorchScript (7s) → Safetensors (5s) → ONNX (4s)
• Kubernetes-level GPU scheduling and resource management strategies

Format Requirements

• Narrative paragraph style with minimal bullet points for mobile reading (WeChat public account format)
• HTML anchor tags for external links instead of markdown syntax
• Line length ≤ 120 characters with proper blank lines around lists
• Bilingual coverage: Chinese (*_zh.md) and English versions

Files Added

docs/blog/2026-01-28/
├── pod-startup-speed.md           (9.0 KB, English general)
├── pod-startup-speed_zh.md        (8.0 KB, Chinese general)
├── gpu-pod-startup-ai.md          (9.8 KB, English AI-focused)
└── gpu-pod-startup-ai_zh.md       (8.9 KB, Chinese AI-focused)

All content derived from docs/kubernetes/pod-startup-speed.md and docs/kubernetes/gpu-pod-cold-start.md with restructured presentation for blog format.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Pod 启动速度 2篇 blog</issue_title>
<issue_description>https://github.com/pacoxu/AI-Infra/blob/main/docs/kubernetes/pod-startup-speed.md
https://github.com/pacoxu/AI-Infra/blob/main/docs/kubernetes/gpu-pod-cold-start.md

根据上面内容 写两篇关于 Pod 启动速度的博客

• 第一篇 通用版本
• 第二篇 针对 AI 场景

中英文双语

减少链接使用，链接使用 非markdown形式展示。

请将以下内容改写成更适合公众号阅读的文案风格：
要求：

• 避免通篇使用 bullet point（项目符号），减少“AI 味”。
• 多使用自然段落、过渡语和叙述感，让文章更像人写的。
• 阅读体验轻松、不疲劳，适合手机端长文阅读。
• 保持原意不变，但让表达更流畅、有温度。
• 篇幅适当控制下，有些例子可以不展开太多。</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Pod 启动速度 2篇 blog #221

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