Harden backend blog error flashes

[jynbil1]

Summary

• replace raw blog API provider messages in backend flash errors with generic user-facing copy
• log structured provider diagnostics for create, update, and delete failures
• add a shell guard to prevent raw provider messages from returning to blog flash errors

/claim #59

Validation

• sh -n tests/check-backend-blog-error-flashes.sh
• sh tests/check-backend-blog-error-flashes.sh
• git diff --check
• PHP lint not run: php is not installed in this environment

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