chore: implement NPM/JSON import routes and fix SMTP persistence
Phase 3 of skipped tests remediation - enables 7 previously skipped E2E tests Backend: Add NPM import handler with session-based upload/commit/cancel Add JSON import handler with Charon/NPM format support Fix SMTP SaveSMTPConfig using transaction-based upsert Add comprehensive unit tests for new handlers Frontend: Add ImportNPM page component following ImportCaddy pattern Add ImportJSON page component with format detection Add useNPMImport and useJSONImport React Query hooks Add API clients for npm/json import endpoints Register routes in App.tsx and navigation in Layout.tsx Add i18n keys for new import pages Tests: 7 E2E tests now enabled and passing Backend coverage: 86.8% Reduced total skipped tests from 98 to 91 Closes: Phase 3 of skipped-tests-remediation plan
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