fix(backend): fix port and health check robustness

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Fix import errors, shadowing, and openapi serialization issues

Fix import errors, shadowing, and openapi serialization issues

Fix import errors, shadowing, and openapi serialization issues

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fix: resolve invalid SQL in health check causing startup failure

fix: robust database initialization for fresh installs

deploy: sync from main Sun Jan 11 18:43:53 WIT 2026