Refactor: split server.js monolith into modular architecture
Extract 3410-line server.js into 12 focused modules:
- src/db.js: database init and migrations
- src/models/{player,course}.js: DB helper functions
- src/scrapers/{browser,player-http,player-puppeteer,course-puppeteer}.js
- src/services/{player-service,rating-calculator}.js
- src/routes/{players,courses,pages}.js
Remove dead code: duplicate saveRatingHistoryToDB, legacy
getPlayerCompetitionRatings/getPredictedRating/getAllRatingsWithScraping,
unused getCourseFromDB/getLatestOfficialRoundDate/testPDGARateLimit,
legacy cache Map, and POST /api/predicted-rating route.
Consolidate 5 duplicated Puppeteer launch blocks into launchBrowser().
server.js is now 28 lines: imports, middleware, mount routers, bootstrap.
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