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/logging_config.py

@@ -0,0 +1,58 @@
+"""
+Configuration structlog — logging structuré JSON/Console.
+
+En production (DEBUG=False) : JSON pour les agrégateurs (ELK, Datadog, etc.)
+En développement (DEBUG=True) : Console colorée lisible.
+"""
+import logging
+import sys
+
+import structlog
+
+
+def configure_logging(debug: bool = False) -> None:
+    """Configure structlog + stdlib logging."""
+    shared_processors = [
+        structlog.contextvars.merge_contextvars,
+        structlog.stdlib.add_log_level,
+        structlog.stdlib.add_logger_name,
+        structlog.processors.TimeStamper(fmt="iso"),
+        structlog.processors.StackInfoRenderer(),
+        structlog.processors.UnicodeDecoder(),
+    ]
+
+    if debug:
+        # Console lisible en dev
+        renderer = structlog.dev.ConsoleRenderer(colors=True)
+    else:
+        # JSON en production
+        renderer = structlog.processors.JSONRenderer()
+
+    structlog.configure(
+        processors=[
+            *shared_processors,
+            structlog.stdlib.ProcessorFormatter.wrap_for_formatter,
+        ],
+        logger_factory=structlog.stdlib.LoggerFactory(),
+        wrapper_class=structlog.stdlib.BoundLogger,
+        cache_logger_on_first_use=True,
+    )
+
+    formatter = structlog.stdlib.ProcessorFormatter(
+        processor=renderer,
+        foreign_pre_chain=shared_processors,
+    )
+
+    handler = logging.StreamHandler(sys.stdout)
+    handler.setFormatter(formatter)
+
+    root_logger = logging.getLogger()
+    root_logger.handlers.clear()
+    root_logger.addHandler(handler)
+    root_logger.setLevel(logging.DEBUG if debug else logging.INFO)
+
+    # Réduire le bruit des librairies tierces
+    logging.getLogger("uvicorn.access").setLevel(logging.WARNING)
+    logging.getLogger("sqlalchemy.engine").setLevel(logging.WARNING)
+    logging.getLogger("httpx").setLevel(logging.WARNING)
+    logging.getLogger("httpcore").setLevel(logging.WARNING)