Add file size conversion and enhance Civitai job processing

- Introduced the `file_size_bytes` function to convert Civitai model sizes from kilobytes to bytes, improving data handling.
- Updated the `seed_civitai` function to include file size in job definitions, enhancing model processing efficiency.
- Enhanced the `should_skip` function to utilize expected size for faster decision-making during job processing.
- Added tests for new functionality, ensuring robustness in file size handling and job processing logic.

src/gpu_rent/provision.py

@@ -11,7 +11,12 @@ from pathlib import Path
 
 import httpx
 
-from gpu_rent.civitai import fetch_model_version, pick_preview_image, pick_primary_file
+from gpu_rent.civitai import (
+    fetch_model_version,
+    file_size_bytes,
+    pick_preview_image,
+    pick_primary_file,
+)
 from gpu_rent.config import Config
 from gpu_rent.errors import CloudError, GpuRentError
 from gpu_rent.manifests import (
@@ -480,6 +485,9 @@ def seed_civitai(cfg: Config, host: str, log: Log) -> None:
                 f"{stem}.swarm.json": json.dumps(swarm, ensure_ascii=False, indent=2),
             },
         }
+        size_b = file_size_bytes(info)
+        if size_b:
+            job["size"] = size_b
         preview = pick_preview_image(version)
         if preview:
             preview_url, preview_suffix = preview