fix(filesystem): exclude test files from build (#2928)

[Higangssh]

Fixes test file compilation in Docker builds by excluding test directories from tsconfig.

Description

Test files were being compiled into dist/ during build, causing TypeScript errors in Docker environments. Added exclude pattern to skip test files.

Server Details

• Server: filesystem
• Changes to: build configuration (tsconfig.json)

Motivation and Context

npm install triggers prepare script which runs tsc. TypeScript tried to compile test files that use vitest globals, causing:
error TS2304: Cannot find name 'afterEach'

How Has This Been Tested?

• Local build and all tests pass
• Docker build completes successfully
• Verified dist/ no longer contains tests/

Breaking Changes

None

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

Added to tsconfig.json:

"exclude": [
  "**/__tests__/**",
  "**/*.test.ts",
  "**/*.spec.ts"
]

Fixes #2928

[olaservo]

Thank you!