Add comparison support

Signed-off-by: Felipe Cardoso <felipe.cardoso@hotmail.it>

backend/app/api/routes/comparison.py

@@ -0,0 +1,68 @@
+# app/api/routes/comparison.py
+
+from fastapi import APIRouter, HTTPException
+from starlette.responses import FileResponse
+
+from app.models.comparison import PathRequest
+from app.services.comparison_service import ComparisonService
+
+router = APIRouter()
+comparison_service = ComparisonService()
+
+
+@router.post("/register")
+async def register_comparison_path(request: PathRequest):
+    """Register a new comparison path and get its ID."""
+    config_id = comparison_service.register_config(request.path)
+    return {"config_id": config_id}
+
+
+@router.get("/image/{config_id}/{config_name}/{model_name}/{filename}")
+async def get_comparison_image(config_id: str, config_name: str, model_name: str, filename: str):
+    """Serve image files using the cached base path."""
+    base_path = comparison_service.get_base_path(config_id)
+    if not base_path:
+        raise HTTPException(status_code=404, detail="Configuration not found")
+
+    try:
+        full_path = base_path / config_name / model_name / filename
+        if not full_path.exists() or not full_path.is_file():
+            raise HTTPException(status_code=404, detail="Image not found")
+
+        return FileResponse(full_path)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
+@router.get("/{config_id}/available")
+async def fetch_available_configs(config_id: str):
+    """Fetch available configs."""
+    base_path = comparison_service.get_base_path(config_id)
+    if not base_path:
+        raise HTTPException(status_code=404, detail="Configuration not found")
+
+    try:
+        return comparison_service.get_available_configs(str(base_path))
+    except ValueError as e:
+        # Convert ValueError from the service into a proper HTTP error
+        raise HTTPException(status_code=404, detail=str(e))
+
+
+@router.get("/{config_id}/{config_name}")
+async def fetch_config(config_id: str, config_name: str):
+    """
+    Fetch detailed comparison data for a specific configuration.
+
+    Parameters:
+        config_id: The identifier returned from the initial path registration
+        config_name: The name of the specific configuration to load (e.g. 'cloth_lora')
+    """
+    base_path = comparison_service.get_base_path(config_id)
+    if not base_path:
+        raise HTTPException(status_code=404, detail="Configuration not found")
+
+    try:
+        return comparison_service.load_config_data(str(base_path), config_name)
+    except ValueError as e:
+        # Convert ValueError from the service into a proper HTTP error
+        raise HTTPException(status_code=404, detail=str(e))