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.

Dockerfile

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+FROM python:3.12-slim
+
+# Dépendances système (Tesseract OCR + données de langues)
+RUN apt-get update && apt-get install -y \
+    tesseract-ocr \
+    tesseract-ocr-fra \
+    tesseract-ocr-eng \
+    libgl1-mesa-glx \
+    libglib2.0-0 \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Dépendances Python
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Code source
+COPY . .
+
+# Répertoires de données
+RUN mkdir -p data/uploads data/thumbnails
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]