[jeffrey-graham]

Summary

Adds comprehensive Vitest unit test suites to significantly increase test coverage across previously untested modules:

• src/allowlist/index.test.ts: Tests initializeAllowlist, checkOriginAllowed, wildcard/subdomain matching (*.domain.com, *), empty origin handling, getAllowedOrigins, addAllowedOrigin (with deduplication & normalization), and removeAllowedOrigin.
• src/import/csv.test.ts: Tests handleCsvUpload validation errors (missing query params, invalid importType, missing primaryKey for update/upsert, empty CSV body) as well as insert, update, upsert batch generation, chunking over 50 rows, type inference (null, boolean, numeric, escaped single quotes), and partial statement failure reporting.
• plugins/sql-macros/index.test.ts: Tests SqlMacrosPlugin registration, NOW()/TODAY()/UUID() macro expansion, custom macros, parameterized macros ($ADD_DAYS(date, days), $FULL_NAME(first, last)), and POST /macros/preview endpoint handling.

Fixes #71

/claim #71

[jeffrey-graham]

Closing this PR since the #71 bounty was already completed and rewarded earlier in #74, and several overlapping test-coverage PRs are already open.