feat: reuse store encryption prompt in profile new flow

[rmanibus]

Summary

• Make profile new consistent with store new when creating a new store interactively.
• Reuse existing store encryption prompting logic instead of duplicating behavior.
• Keep encryption detection logic centralized and shared.

What Changed

• cmd/cloudstic/cmd_profile.go
  • Track whether a store was newly created during profile new.
  • When a new store is created in interactive mode, invoke promptEncryptionConfig(...).
  • Extend promptStoreSelection(...) to return whether a store was created.
• cmd/cloudstic/cmd_store.go
  • Add shared helper storeHasExplicitEncryption(...).
  • Reuse helper in runStoreNew and checkOrInitStore.

Why

Previously, users got encryption/keychain setup prompts when using store new, but not when creating a store from profile new, which created inconsistent UX and left newly created profile stores without guided secret setup.

Validation

• go test ./cmd/cloudstic -count=1
• golangci-lint run ./...

[codecov]

Codecov Report

❌ Patch coverage is 8.69565% with 21 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cmd/cloudstic/cmd_profile.go	12.50%	13 Missing and 1 partial ⚠️
cmd/cloudstic/cmd_store.go	0.00%	7 Missing ⚠️

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