fix: exclude external service documents from main client type generation

[productdevbook]

Summary

• Fixed GraphQL Document Validation errors when using external services
• Enhanced scanDocs function to properly filter external service documents
• Prevents external service queries from being validated against local schema

Problem

External service document files were being incorrectly included in the main client type generation process and validated against the local server schema, causing validation failures when external service queries referenced fields not present in the local schema.

This resulted in errors like:

Cannot query field "countries" on type "Query"
Cannot query field "country" on type "Query"

Solution

Enhanced the scanDocs function in src/utils/index.ts to:

1. Extract document patterns from configured external services
2. Filter out files that match external service document patterns
3. Ensure external service documents are only validated against their respective schemas

Test plan

• Built the module successfully with pnpm build
• Tested with Nuxt playground - no more validation errors
• Confirmed external service types are still generated correctly
• Verified both local and external GraphQL services work as expected

Impact

• Resolves client type generation failures when using external GraphQL services
• Maintains proper separation between local and external service document validation
• No breaking changes to existing functionality