feat(properties): prepare property commands before execution

- Create missing note files before running property:set.
- Default date-only datetime values to midnight.
- Keep property names out of path authorization checks.
- Split policy, vault, daily note, and command target helpers.
- Split n8n node args, description, output, and API response helpers.
- Split API tests by auth, command, daily note, and property behavior.
- Bump API and n8n node versions.

app/main.py

@@ -10,7 +10,8 @@ from starlette.routing import Route
 from app import auth
 from app.auth import require_auth
 from app.config import CLI_BIN, DEFAULT_TIMEOUT, HOST, MAX_TIMEOUT, PORT, VAULT_PATH
-from app.policy import authorize_command, vault_for_path
+from app.policy import authorize_command
+from app.vaults import vault_for_path
 from app.runner import execute_command
 
 def error(status_code:int, detail:str) -> JSONResponse: