fix: recover failed Gaussian project builds

src/k1link/simulation/projects.py

@@ -239,7 +239,7 @@ class SimulationProjectStore:
     def begin_build(self, project_id: str) -> dict[str, Any]:
         with self._lock:
             document = self._read(project_id)
-            if document["status"] != "uploading":
+            if document["status"] not in {"uploading", "failed"}:
                 raise SimulationProjectConflictError("simulation project cannot start a build")
             if any(
                 int(item["uploaded_bytes"]) != int(item["byte_length"])
@@ -247,6 +247,15 @@ class SimulationProjectStore:
             ):
                 raise SimulationProjectConflictError("simulation source upload is incomplete")
             document["status"] = "queued"
+            document["provider"] = {
+                "provider_id": "gaussian-pipeline",
+                "job_id": None,
+                "state": None,
+                "progress": None,
+                "runtime": None,
+            }
+            document["artifacts"] = []
+            document["world_manifest"] = None
             document["error"] = None
             document["updated_at_utc"] = utc_now_iso()
             self._write(document)
@@ -402,6 +411,22 @@ class SimulationProjectService:
             ).start()
         return len(pending)
 
+    def begin_build(self, project_id: str) -> dict[str, Any]:
+        project = self.store.get(project_id)
+        if project.get("status") == "failed":
+            job_id = project["provider"].get("job_id")
+            if isinstance(job_id, str):
+                provider = self.provider_factory()
+                if provider is None:
+                    raise SimulationProjectConflictError(
+                        "Gaussian Pipeline недоступен для повторной сборки."
+                    )
+                try:
+                    provider.delete_job(job_id)
+                finally:
+                    provider.close()
+        return self.store.begin_build(project_id)
+
     def process(self, project_id: str) -> None:
         provider: GaussianPipelineGateway | None = None
         try: