* fix(seed-economy): use gate.decodo.com for FRED CONNECT proxy, add fallback logging
resolveProxyString() replaces gate. → us.decodo.com for curl compatibility,
but httpsProxyFetchJson uses HTTP CONNECT tunneling which requires gate.decodo.com.
All FRED series were silently failing with "Parse Error: Expected HTTP/, RTSP/ or ICE/"
because us.decodo.com doesn't respond to CONNECT with valid HTTP.
- Add resolveProxyStringConnect() in _proxy-utils.cjs (no host replacement)
- Export resolveProxyForConnect() from _seed-utils.mjs for CONNECT-based proxy
- seed-economy: _proxyAuth uses resolveProxyForConnect() (FRED), _curlProxyAuth uses resolveProxy() (Yahoo)
- fredFetchJson now logs when direct fails and proxy is tried, labels proxy errors as "proxy: ..."
* fix(seed-economy): roll out resolveProxyForConnect to all FRED seeders
seed-economic-calendar, seed-supply-chain-trade, and seed-bls-series were
still passing the curl-oriented us.decodo.com proxy string to fredFetchJson,
which uses HTTP CONNECT tunneling and requires gate.decodo.com.
Previously each seeder (ais-relay.cjs, _seed-utils.mjs, seed-fear-greed.mjs,
seed-disease-outbreaks.mjs) had its own inline resolveProxy() with slightly
different implementations. This caused USNI seeding to fail because
parseProxyUrl() only handled URL format while PROXY_URL uses Decodo
host:port:user:pass format.
- Add scripts/_proxy-utils.cjs with parseProxyConfig(), resolveProxyConfig(),
resolveProxyString() handling both http://user:pass@host:port and
host:port:user:pass formats
- ais-relay.cjs: require _proxy-utils.cjs, alias parseProxyUrl = parseProxyConfig
- _seed-utils.mjs: import resolveProxyString via createRequire, delegate resolveProxy()
- seed-fear-greed.mjs, seed-disease-outbreaks.mjs: remove inline resolveProxy(),
import from _seed-utils.mjs instead
