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feat: add `--cache-ttl-floor` for non-sensitive DNS records (#118)

* feat: add `--cache-ttl-floor` for non-sensitive DNS records

Introduces a configurable minimum TTL for cached DNS entries. Entries
not considered "freshness sensitive" (e.g., SOA, TXT, or those matching
OCSP/CRL/PKI patterns) will now respect this floor to improve cache
hit rates for static records.

* refactor: use time.Duration for CacheTtlFloor

Change `CacheTtlFloor` from an integer to `time.Duration` to improve
readability, type safety, and consistency with Go's time handling
conventions.

* fix: validate cacheTtlFloor in NewDNSDispatcher

Ensure `cacheTtlFloor` is non-negative to prevent unexpected behavior
during cache initialization. Added a unit test to verify the error
handling.

* refactor: use effectiveTTL variable in TTL check

Clean up the redundant duration calculation by using the existing
`effectiveTTL` variable for readability.

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505 of 1220 relevant lines covered (41.39%)

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