Add comprehensive test suite for image processing and related services

- Implement tests for database generator to ensure proper session handling.
- Create tests for EXIF extraction and conversion functions.
- Add tests for image-related endpoints, ensuring proper data retrieval and isolation between clients.
- Develop tests for OCR functionality, including language detection and text extraction.
- Introduce tests for the image processing pipeline, covering success and failure scenarios.
- Validate rate limiting functionality and ensure independent counters for different clients.
- Implement scraper tests to verify HTML content fetching and error handling.
- Add unit tests for various services, including storage and filename generation.
- Establish worker entry point for ARQ to handle background image processing tasks.

.env.example

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+# ============================================================
+# Imago — Configuration
+# Copier ce fichier en .env et remplir les valeurs
+# ============================================================
+
+# Application
+APP_NAME="Imago"
+APP_VERSION="1.0.0"
+DEBUG=true
+SECRET_KEY="changez-moi-en-production-avec-une-cle-aleatoire-longue"
+
+# AI — Configuration
+AI_ENABLED=true
+
+# AI — Provider (gemini/openrouter)
+AI_PROVIDER="openrouter"
+
+# Serveur
+HOST=0.0.0.0
+PORT=8000
+
+# Base de données
+DATABASE_URL="sqlite+aiosqlite:///./data/imago.db"
+# Pour PostgreSQL:
+# DATABASE_URL="postgresql+asyncpg://user:password@localhost/shaarli"
+
+# Stockage des fichiers
+UPLOAD_DIR="./data/uploads"
+THUMBNAILS_DIR="./data/thumbnails"
+MAX_UPLOAD_SIZE_MB=50
+
+# AI — Google Gemini
+GEMINI_API_KEY="AIza..."
+GEMINI_MODEL="gemini-3.1-pro-preview"
+GEMINI_MAX_TOKENS=1024
+
+# AI - Openrouter
+# model name : mistralai/mistral-small-3.1-24b-instruct:free
+# model name : google/gemini-2.0-flash-001
+OPENROUTER_API_KEY="..."
+OPENROUTER_MODEL="qwen/qwen2.5-vl-72b-instruct"
+
+# AI — Comportement
+AI_TAGS_MIN=5
+AI_TAGS_MAX=10
+AI_DESCRIPTION_LANGUAGE="français"
+AI_CACHE_DAYS=30
+
+# OCR
+OCR_ENABLED=true
+TESSERACT_CMD="/usr/bin/tesseract"
+OCR_LANGUAGES="fra+eng"
+
+# CORS
+CORS_ORIGINS=["http://localhost:3000","http://localhost:8080","http://localhost:5173"]
+
+# Authentification
+ADMIN_API_KEY=""
+JWT_SECRET_KEY="changez-moi-jwt-secret-en-production"
+JWT_ALGORITHM="HS256"
+
+# Rate Limiting (requêtes par minute — legacy)
+RATE_LIMIT_UPLOAD=10
+RATE_LIMIT_AI=20
+
+# Rate Limiting par plan (requêtes par heure)
+RATE_LIMIT_FREE_UPLOAD=20
+RATE_LIMIT_FREE_AI=50
+RATE_LIMIT_STANDARD_UPLOAD=100
+RATE_LIMIT_STANDARD_AI=200
+RATE_LIMIT_PREMIUM_UPLOAD=500
+RATE_LIMIT_PREMIUM_AI=1000