fix rotate-key crash when no default profile exists

[knQzx]

summary

• fix rotate-key crashing when no default profile exists in config
• check if config exists before loading default profile, create if needed

test plan

• verified rotate-key no longer panics without a default profile

fixes #9547

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Note

Low Risk
Low risk: changes are limited to CLI profile/config handling when saving the rotated key, mainly adding existence checks and fallbacks to defaults.

Overview
aptos account rotate-key no longer crashes when run without an existing CLI config or a default profile.

The command now checks whether a config file exists before loading it during profile-name validation, creates a default config when saving a new profile if none exists, and builds the new ProfileConfig using a default base profile when the current profile can’t be loaded.

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