feat: secure and document book reviews system

Added rate limiting to APIs, cleaned up docs, implemented fallback logic for reviews without text, and added comprehensive n8n guide.

GEMINI.md

@@ -1,47 +0,0 @@
-# GEMINI.md - Portfolio Project Guide
-
-## Project Overview
-Personal portfolio for Dennis Konkol (dk0.dev). A modern, high-performance Next.js 15 application featuring a "liquid" design system, integrated with Directus CMS and n8n for real-time status and content management.
-
-## Tech Stack & Architecture
-- **Framework**: Next.js 15 (App Router), TypeScript, React 19.
-- **UI/UX**: Tailwind CSS 3.4, Framer Motion 12, Three.js (Background).
-- **Backend/Data**: PostgreSQL (Prisma), Redis (Caching), Directus (CMS), n8n (Automation).
-- **i18n**: next-intl (German/English).
-
-## Core Principles for Gemini
-- **Safe Failovers**: Always implement fallbacks for external APIs (Directus, n8n). The site must remain functional even if all external services are down.
-- **Liquid Design**: Use custom `liquid-*` color tokens for consistency.
-- **Performance**: Favor Server Components where possible; use `use client` only for interactivity.
-- **Code Style**: clean, modular, and well-typed. Use functional components and hooks.
-- **i18n first**: Never hardcode user-facing strings; always use `messages/*.json`.
-
-## Common Workflows
-
-### API Route Pattern
-API routes should include:
-- Rate limiting (via `lib/auth.ts`)
-- Timeout protection
-- Proper error handling with logging in development
-- Type-safe responses
-
-### Component Pattern
-- Use Framer Motion for entrance animations.
-- Use `next/image` for all images to ensure optimization.
-- Follow the `glassmorphism` aesthetic: `backdrop-blur-sm`, subtle borders, and gradient backgrounds.
-
-## Development Commands
-- `npm run dev`: Full development environment.
-- `npm run lint`: Run ESLint checks.
-- `npm run test`: Run unit tests.
-- `npm run test:e2e`: Run Playwright E2E tests.
-
-## Environment Variables (Key)
-- `DIRECTUS_URL` & `DIRECTUS_STATIC_TOKEN`: CMS connectivity.
-- `N8N_WEBHOOK_URL` & `N8N_SECRET_TOKEN`: Automation connectivity.
-- `DATABASE_URL`: Prisma connection string.
-
-## Git Workflow
-- Work on the `dev` branch.
-- Use conventional commits: `feat:`, `fix:`, `chore:`, `docs:`, `refactor:`.
-- Push to both GitHub and Gitea remotes.