feat(ai-seo): removed PoC api

[dmitriigulkin-semrush]

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[github-actions]

This PR will trigger no release when merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[MysticatBot]

Hey @dmitriigulkin-semrush,

Verdict: Approve - clean removal of PoC endpoints with no orphaned references or authorization gaps.
Complexity: HIGH - large diff (10700+ lines, 29 files); API surface + FACS capability changes.
Changes: Removes 19 old proof-of-concept AI Visibility API endpoints (pre-v1), their handlers, utilities, tests, FACS entries, and OpenAPI docs while preserving all v1 endpoints (29 files).

Non-blocking (2): minor issues and suggestions

• nit: PR body is empty - consider adding a one-liner referencing the ticket and noting that v1 endpoints are unaffected, for release-note consumers - PR description
• nit: title uses past tense ("removed") rather than imperative mood ("remove") per conventional commit convention - PR title

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