fix: validate and clamp cache TTL to reasonable bounds

[saurabhhhcodes]

Added clampTTL helper that enforces TTL between 1 minute and 7 days. Applied validation in SetTTL, loadConfig, and DefaultConfig to prevent zero/negative values or unbounded TTL.

Closes #445

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Reviewing files that changed from the base of the PR and between 6d6fa89 and cdfd688.

📒 Files selected for processing (9)

• README.md
• cmd/analyze.go
• cmd/compare.go
• internal/analyzer/certificate.go
• internal/cache/cache.go
• internal/github/releases.go
• internal/output/compare.go
• internal/scheduler/scheduler.go
• internal/ui/app.go

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