Slack Bolt to Teams SDK porting guide

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First draft for Slack Bolt -> Teams SDK porting guide.

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[Copilot]

Pull request overview

This PR adds a comprehensive porting guide to help developers migrate their Slack Bolt applications to the Teams SDK. The guide provides side-by-side comparisons of concepts, code examples, and migration steps for authentication, message handlers, and adaptive cards.

Changes:

• Added new Slack Bolt to Teams SDK migration guide with detailed comparison tables covering installation, authentication, messaging, cards, and AI features
• Created TypeScript code examples demonstrating migration patterns for app configuration, message handlers, adaptive cards, and OAuth authentication
• Updated authentication patterns across multiple existing migration guides to use consistent await signin() pattern instead of isSignedIn checks

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
teams.md/static/missing-pages.json	Added entry indicating C# and Python implementations are not yet available for the new Slack Bolt migration guide
teams.md/src/pages/templates/migrations/slack-bolt.mdx	New comprehensive migration guide comparing Slack Bolt and Teams SDK concepts with detailed comparison table
teams.md/src/components/include/migrations/slack-bolt/typescript.incl.md	TypeScript code examples showing migration patterns for app setup, message handlers, adaptive cards, Graph API usage, and external OAuth
teams.md/src/components/include/migrations/v1/typescript.incl.md	Updated authentication examples to use consistent await signin() pattern
teams.md/src/components/include/migrations/botbuilder/user-authentication/typescript.incl.md	Updated authentication pattern for consistency
teams.md/src/components/include/in-depth-guides/user-authentication/typescript.incl.md	Updated authentication examples to use consistent await signin() pattern

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