On a fresh install the security_configs table is auto-migrated but
contains no rows. Any code path reading SecurityConfig by name received
an empty Go struct with zero values, producing an all-disabled UI state
that offered no guidance to the user and made the security status
endpoint appear broken.
Adds a SeedDefaultSecurityConfig function that uses FirstOrCreate to
guarantee a default row exists with safe, disabled-by-default values on
every startup. The call is idempotent — existing rows are never modified,
so upgrades are unaffected. If the seed fails the application logs a
warning and continues rather than crashing.
Zero-valued rate-limit fields are intentional and safe: the Cerberus
rate-limit middleware applies hardcoded fallback thresholds when the
stored values are zero, so enabling rate limiting without configuring
thresholds results in sensible defaults rather than a divide-by-zero or
traffic block.
Adds three unit tests covering the empty-database, idempotent, and
do-not-overwrite-existing paths.
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