fix: Use absolute paths for debug_dumps directory

- Changed debug_dumps path from relative to absolute (/app/debug_dumps)
- Updated direct_search_service.py to use consistent absolute path
- Updated debug.py router to use the same absolute path
- Added debug_dumps directory creation in Dockerfile
- Improved _dump_debug_html with safer filename handling

app/routers/debug.py

@@ -18,7 +18,8 @@ router = APIRouter(
 
 logger = logging.getLogger(__name__)
 
-DEBUG_DIR = "debug_dumps"
+# Chemin absolu pour les dumps de débogage (doit correspondre à celui dans direct_search_service.py)
+DEBUG_DIR = "/app/debug_dumps"
 
 class DebugFile(BaseModel):
     filename: str