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.

app/middleware/logging_middleware.py

@@ -0,0 +1,41 @@
+"""
+Middleware de logging HTTP — enregistre chaque requête avec structlog.
+
+Exclut les endpoints de santé (/health, /metrics) pour réduire le bruit.
+"""
+import time
+import logging
+from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.requests import Request
+from starlette.responses import Response
+
+logger = logging.getLogger("http")
+
+# Chemins exclus du logging
+_EXCLUDED_PATHS = {"/health", "/health/detailed", "/metrics", "/favicon.ico"}
+
+
+class LoggingMiddleware(BaseHTTPMiddleware):
+    async def dispatch(self, request: Request, call_next) -> Response:
+        if request.url.path in _EXCLUDED_PATHS:
+            return await call_next(request)
+
+        start = time.monotonic()
+        client_id = getattr(request.state, "client_id", "anonymous")
+
+        response = await call_next(request)
+
+        duration_ms = int((time.monotonic() - start) * 1000)
+
+        logger.info(
+            "http.request",
+            extra={
+                "method": request.method,
+                "path": request.url.path,
+                "status": response.status_code,
+                "duration_ms": duration_ms,
+                "client_id": str(client_id),
+            },
+        )
+
+        return response