chore(infra): add AI flyer parsing configuration and retry logic

- Add FLYER_AI_TIMEOUT_MS and FLYER_AI_RETRIES environment variables
- Configure timeout and retry settings in compose.yml
- Update AiFlyerParserService with configurable timeout and retry logic
- Add text window reduction strategy for retry attempts
- Update documentation in TEKNISK_BESKRIVNING.md
- Fix ESLint configuration in app.security.spec.ts

.env.example

@@ -16,9 +16,11 @@ AUTH_SECRET=byt-ut-mig
 # OBS: Appen vägrar starta om detta saknas.
 JWT_SECRET=byt-ut-mig
 
-# Mistral AI
-# Hämtas från: https://console.mistral.ai/
-MISTRAL_API_KEY=
+# Mistral AI
+# Hämtas från: https://console.mistral.ai/
+MISTRAL_API_KEY=
+FLYER_AI_TIMEOUT_MS=45000
+FLYER_AI_RETRIES=2
 
 # Publik URL (används av frontend)
 NEXT_PUBLIC_APP_URL=https://recept.gynther.se