A run says whether the dashboard, the CLI or a script asked for it

`POST /runs/flows/{name}` hardcoded `cause: "api"`, so every row in the
history claimed the same origin. The body now carries an optional `cause`,
closed to the values the column knows — the dashboard sends nothing and stays
"api", `fluksio run` says "cli", and the SDK client says "sdk".

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013Gf7WaExcJ9bs3kfJXB3nK

backend/tests/test_cli.py

@@ -200,9 +200,10 @@ def test_a_local_run_always_waits(monkeypatch) -> None:
         def get_flow(self, name: str) -> dict[str, object]:
             return {"definition": {"inputs": []}}
 
-        def submit(self, flow, params, seed=None, no_cache=False):
+        def submit(self, flow, params, seed=None, no_cache=False, cause="sdk"):
             submitted["flow"] = flow
             submitted["no_cache"] = no_cache
+            submitted["cause"] = cause
             return FakeHandle()
 
         def run(self, run_id: str) -> dict[str, object]:
@@ -216,7 +217,13 @@ def test_a_local_run_always_waits(monkeypatch) -> None:
 
     args = _parser().parse_args(["run", "train", "--local", "--no-sync", "--no-cache"])
     assert cli.cmd_run(args, []) == 0
-    assert submitted == {"flow": "train", "no_cache": True, "waited": True}
+    # "cli" rather than the SDK's default: the history says which asked.
+    assert submitted == {
+        "flow": "train",
+        "no_cache": True,
+        "waited": True,
+        "cause": "cli",
+    }
 
 
 def test_ctrl_c_while_waiting_cancels_the_run(monkeypatch) -> None:
@@ -240,7 +247,7 @@ def test_ctrl_c_while_waiting_cancels_the_run(monkeypatch) -> None:
         def get_flow(self, name: str) -> dict[str, object]:
             return {"definition": {"inputs": []}}
 
-        def submit(self, flow, params, seed=None, no_cache=False):
+        def submit(self, flow, params, seed=None, no_cache=False, cause="sdk"):
             return FakeHandle()
 
         def cancel(self, run_id: str) -> None: