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

frontend/src/client/schemas.gen.ts

@@ -2384,6 +2384,12 @@ export const RunCreateSchema = {
             type: 'boolean',
             title: 'No Cache',
             default: false
+        },
+        cause: {
+            type: 'string',
+            enum: ['api', 'cli', 'sdk'],
+            title: 'Cause',
+            default: 'api'
         }
     },
     type: 'object',