docs(review): fix table names, IMAGE_DIR, image endpoints

- ARCHITECTURE.md: ingredient/step (waren faelschlich recipe_*)
- OPERATIONS.md: IMAGE_DIR (statt IMAGES_PATH)
- session-handoff: /api/recipes/[id]/image POST/DELETE ergaenzt

Findings aus REVIEW-2026-04-18.md / docs-vs-code.md

docs/superpowers/session-handoff-2026-04-17.md

@@ -43,7 +43,7 @@ docker compose -f docker-compose.prod.yml up -d
 ### Server-Seite
 - **DB:** SQLite mit FTS5, Migrationen (`./migrations/*.sql`) werden von Vite gebündelt und beim ersten DB-Zugriff angewendet. Auto-mkdir für `data/` und `data/images/`.
 - **Module:** `parsers/` (iso8601, ingredient, json-ld-recipe), `recipes/` (scaler + repository + actions + importer + search-local), `domains/` (repository + whitelist), `profiles/`, `images/image-downloader`, `search/searxng`, `backup/export`, `http`.
-- **Routes:** `/api/health`, `/api/profiles`, `/api/profiles/[id]`, `/api/domains`, `/api/domains/[id]`, `/api/recipes/search`, `/api/recipes/search/web`, `/api/recipes/preview`, `/api/recipes/import`, `/api/recipes/[id]`, `/api/recipes/[id]/rating`, `/api/recipes/[id]/favorite`, `/api/recipes/[id]/cooked`, `/api/recipes/[id]/comments`, `/api/admin/backup`, `/images/[filename]`.
+- **Routes:** `/api/health`, `/api/profiles`, `/api/profiles/[id]`, `/api/domains`, `/api/domains/[id]`, `/api/recipes/search`, `/api/recipes/search/web`, `/api/recipes/preview`, `/api/recipes/import`, `/api/recipes/[id]`, `/api/recipes/[id]/rating`, `/api/recipes/[id]/favorite`, `/api/recipes/[id]/cooked`, `/api/recipes/[id]/comments`, `/api/recipes/[id]/image` (POST/DELETE), `/api/admin/backup`, `/images/[filename]`.
 
 ### Client-Seite (Svelte 5 Runes)
 - **Layout** mit Profil-Chip und Zahnrad zu Admin.