chore(types): add type check

[LiteSun]

Description

1. Fix type errors across all projects
   sdk differ converter-openapi backend-api7 backend-apisix-standalone backend-apisix cli
2. Add a CI check for type checking

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible

[Copilot]

Pull Request Overview

This PR performs a major dependency downgrade, changing Vitest from version 3.2.4 to 3.0.0, alongside TypeScript type safety improvements and code quality enhancements across multiple backend implementations (APISIX, API7) and the SDK. The changes include adding explicit type assertions, fixing type compatibility issues, and improving null safety handling throughout the codebase.

• Downgraded vitest from 3.2.4 to 3.0.0 with corresponding dependency adjustments
• Added type assertions and explicit casting to resolve TypeScript strict mode violations
• Refactored schema definitions to better support plugin configuration types

Reviewed Changes

Copilot reviewed 32 out of 34 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Downgraded vitest and related dependencies from 3.2.4 to 3.0.0, added package dependencies to apps/cli and libs/sdk
libs/sdk/src/core/schema.ts	Changed pluginsSchema from record type to single plugin schema, added UpstreamHealthCheck type export, extended ConfigurationSchema with new optional fields
libs/sdk/src/backend/index.ts	Made httpAgent and httpsAgent optional in BackendOptions
libs/backend-apisix/src/transformer.ts	Added extensive type assertions and null-safety checks throughout transformation methods
libs/backend-apisix/src/typing.ts	Changed GlobalRule and PluginMetadata from record types to direct types
libs/backend-api7/src/transformer.ts	Improved type safety with explicit return types and type assertions
libs/backend-api7/src/index.ts	Added non-null assertions and improved type guards in defaultValue method
apps/cli/src/utils/listr.ts	Replaced logical AND shortcuts with explicit if statements for better readability
apps/cli/package.json	Moved dependencies from devDependencies to dependencies
.github/workflows/lint.yaml	Added new GitHub Actions workflow for lint checking

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[bzp2010]

🤔

[bzp2010]

This is to allow recursiveOmitUndefined to remove them; please leave it as is.

First, the id, name, consumers expanded from consumerGroup will be overwritten with undefined, then subsequently removed by recursiveOmitUndefined—that's how they function.
Additionally, this modification is useless, as ADC does not support Consumer Group; thus, they are now essentially placeholders.