Serve the provider lineup at /api/lineup.json - #19
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One entry per channel position, sorted by number, with station metadata, Gracenote station filters, and the resolved logo. Provider name, type, and location come from the saved setup when it matches the lineup the guide was built from. Returns 503 with Retry-After until the first guide exists, matching /api/guide.json.
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PR 3 of #15. Stacked on #18.
Changes
GET /api/lineup.json: every position in the active lineup, sorted by channel number, with station ID, placement ID, callsign, affiliate, affiliate callsign, Gracenote station filters, and the resolved logo URL. A station carried at two numbers appears twice.sourceblock carries the lineup identifiers from the guide itself. Provider name, type, and location are filled from the saved setup only when it describes the same lineup the guide was built from, so a stale guide can never be labeled with a newer provider's name.Retry-After: 30until the first guide exists, same CORS header and encoder settings as/api/guide.json.Tests
lineup_handler_test.gocovers: 503 before the first guide; full response decode with sort order, field mapping, and duplicate-station positions; exact JSON key sets at every level so a rename fails loudly, includingfiltersomitted when empty andlogoUrlalways present; provider naming blank with no config and blank when the config describes a different lineup; and that serialization sorts a copy rather than the live guide.