Add AI Sessionizer first-look blog

[wu-sheng]

Summary

• introduce the pre-alpha Apache SkyWalking AI Sessionizer project and its current Claude Code path
• explain evidence-based session assembly, Talks, Runs, execution streams, and fetch-period Segments
• add a no-hook local quick start, product screenshots, and two explanatory diagrams
• share the roadmap for unified local and remote collection, more agent ecosystems, and session analysis

Verification

• hugo --destination /tmp/skywalking-ai-sessionizer-pr-build
• xmllint validation for both SVG figures
• git diff --cached --check

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