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/vaults.py

@@ -0,0 +1,30 @@
+from pathlib import Path
+
+from app.config import DEFAULT_VAULT_NAME, REGISTERED_VAULTS
+from app.command_target import CommandTarget
+
+def vault_for_path(path:Path) -> str|None:
+  resolved = path.resolve()
+  best_name:str|None = None
+  best_len = -1
+
+  for name, vault_path in REGISTERED_VAULTS.items():
+    root = Path(vault_path).resolve()
+    try:
+      resolved.relative_to(root)
+    except ValueError:
+      continue
+
+    root_len = len(str(root))
+    if root_len > best_len:
+      best_name = name
+      best_len = root_len
+
+  return best_name
+
+def vault_root_for_target(target:CommandTarget, cwd:Path) -> Path:
+  if target.vault and target.vault in REGISTERED_VAULTS:
+    return Path(REGISTERED_VAULTS[target.vault]).resolve()
+
+  vault_name = vault_for_path(cwd) or DEFAULT_VAULT_NAME
+  return Path(REGISTERED_VAULTS.get(vault_name, cwd)).resolve()