refactor: Migrate route handlers to createSimpleHandler pattern

- Switch route handlers from createRouteHandler + Effect.fn to createSimpleHandler + Effect.gen
- Add isMcpDebugOrLocal helper function to mcp-environments.ts
- Clean up deleted summary/documentation files
- Update various route handlers for consistency
- Update test files and configuration files

Co-authored-by: Cursor <cursoragent@cursor.com>