fix(cty): retry cty.dat fetch with exponential backoff#1132
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A transient failure (timeout, slow DNS, container boot race) on the single startup fetch left the app stranded on the built-in 120-entry fallback prefix table for 24 hours until the next scheduled refresh. Add fetchWithRetry() with 3 attempts and 5s/10s/20s backoff, wired into both initCtyData() and the 24h periodic refresh interval. The fetch function is injectable for testing. Adds ctydat.test.js covering: first-try success, fail-then-succeed, all-attempts-fail, and parse round-trip.
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A transient failure (timeout, slow DNS, container boot race) on the single startup fetch left the app stranded on the built-in 120-entry fallback prefix table for 24 hours until the next scheduled refresh.
Add fetchWithRetry() with 3 attempts and 5s/10s/20s backoff, wired into both initCtyData() and the 24h periodic refresh interval. The fetch function is injectable for testing.
Adds ctydat.test.js covering: first-try success, fail-then-succeed, all-attempts-fail, and parse round-trip.