Created the foundational middleware folder structure in the Mind Block monorepo with all necessary configuration files and a comprehensive README.

[Nemenwq]

Created mindBlock_app/middleware/ workspace package at the repo root.
Created full folder structure exactly as specified:
src/ with common/ (interfaces/, types/, constants/, utils/) and category folders (auth, security, performance, monitoring, validation, config)
tests/ (unit/, integration/, setup.ts)
docs/ with .gitkeep
Added .gitkeep files to empty directories for git tracking.
Added configs/files
package.json, tsconfig.json, jest.config.js, eslint.config.mjs (ESLint v9 flat config), .eslintrc.js (left present though not used by ESLint v9), .prettierrc, .gitignore
src/index.ts with placeholder exports
index.ts in each category folder (with placeholder exports so TS treats them as modules)
README.md with the required sections
Integrated into monorepo workspaces
Updated root package.json "workspaces" to include "middleware".

closes #331

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