add mixed capacity providers with step function scaling

[eoinsha]

• chore: add second function for manual scaling
• feat: add API for auto and processing for manual capacity providers

[Copilot]

Pull request overview

This PR transforms a minimal Lambda MI example into a comprehensive video processing service demonstration. It adds a dual-capacity provider architecture with auto-scaling for API workloads and manual scaling for batch processing, orchestrated through Step Functions.

• Replaces Jest testing framework with Biome for linting/formatting
• Implements a complete video processing API with DynamoDB storage
• Adds Step Functions workflow for dynamic capacity scaling
• Creates three Lambda functions: API handler, video processor, and scaling controller

Reviewed changes

Copilot reviewed 15 out of 22 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tsconfig.json	Simplified formatting and added skipLibCheck option
package.json	Removed Jest dependencies, added Biome for code quality
package-lock.json	Updated dependencies reflecting Jest removal and Biome addition
test/lambda-mi.test.ts	Removed placeholder test file
jest.config.js	Removed Jest configuration
lib/lambda-mi-stack.ts	Expanded from basic example to full video processing service with dual capacity providers
functions/video-api/*	New API Lambda function for video CRUD operations
functions/video-processor/*	New processor Lambda for simulated video processing
functions/scaling-function/*	New scaling controller Lambda for manual capacity adjustments
biome.json	New Biome configuration for linting and formatting
demo.sh	New demo script for testing the deployed service
README.md	Comprehensive documentation of the video processing architecture
.github/copilot-instructions.md	New GitHub Copilot guidance document
cdk.context.json	Added VPC lookup context

Files not reviewed (3)

• functions/scaling-function/package-lock.json: Language not supported
• functions/video-api/package-lock.json: Language not supported
• functions/video-processor/package-lock.json: Language not supported

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