fix(providers): validate Vercel::with_base_url's api root, not just connect_to's

[senamakel]

Summary

• Follow-up to Unified hosting API with a Vercel provider #2, which merged before this last CodeRabbit-flagged fix landed.
• Vercel::with_base_url bypassed the https://-or-loopback validation that connect_to applies, so a caller reaching this public constructor directly with a non-loopback http:// root would send the bearer token in cleartext.
• with_base_url now runs the same providers::is_secure_base_url check and returns Error::InsecureBaseUrl before building the client.

Test plan

• cargo fmt --all -- --check
• cargo clippy --all-targets --all-features -- -D warnings
• cargo build --all-targets --all-features
• cargo test --all-features (new test: with_base_url_rejects_plain_http_against_a_non_loopback_host)
• cargo test (default features)
• .github/scripts/check-file-coverage.sh 90 coverage.json (every file ≥90%)

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Run ID: cb3dfa24-1257-4b4f-af1f-ee8a116e7c89

📥 Commits

Reviewing files that changed from the base of the PR and between 8b82aaa and dd15281.

📒 Files selected for processing (3)

• src/providers/mod.rs
• src/providers/vercel/mod.rs
• src/providers/vercel/test.rs

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