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.

requirements.txt

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+# Web Framework
+fastapi==0.115.0
+uvicorn[standard]==0.30.6
+python-multipart==0.0.9
+
+# Database
+sqlalchemy==2.0.35
+alembic==1.13.3
+aiosqlite==0.20.0
+
+# Validation
+pydantic==2.9.2; python_version < "3.14"
+pydantic>=2.12.0; python_version >= "3.14"
+pydantic-settings==2.5.2
+
+# Image Processing
+Pillow==10.4.0; python_version < "3.14"
+Pillow>=11.0.0; python_version >= "3.14"
+piexif==1.1.3
+
+# OCR
+pytesseract==0.3.13
+
+# AI
+google-genai==1.0.0
+httpx==0.27.2
+
+# Web scraping (pour les URLs)
+beautifulsoup4==4.12.3
+
+# Task scheduling
+apscheduler==3.10.4
+
+# Task queue (ARQ + Redis)
+arq==0.25.0
+redis==5.0.8
+
+# Storage abstraction (S3/MinIO)
+aioboto3==13.0.0
+itsdangerous==2.2.0
+
+# Observability
+structlog==24.4.0
+prometheus-fastapi-instrumentator==7.0.2
+
+# Utilities
+python-dotenv==1.0.1
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+aiofiles==24.1.0
+
+# Rate Limiting
+slowapi==0.1.9