refactor: hardcode API IDs and coaster lists, remove Playwright discovery

Embed Six Flags API IDs directly in the park registry and snapshot
coaster lists from park-meta.json into a TypeScript module. This
eliminates the Playwright-based discovery script, RCDB scraper, and
runtime dependency on park-meta.json — preparing for the backend
API transition.

- Add apiId field to Park type and all 24 park entries
- Create lib/coaster-data.ts with hardcoded coaster lists
- Update page components to use park.apiId and new getCoasterSet()
- Remove scripts/discover.ts, lib/scrapers/rcdb.ts, lib/park-meta.ts
- Remove data/park-meta.json from shared volume
- Remove playwright devDependency and discover npm script
- Simplify scripts/scrape.ts (no RCDB, no discovery checks)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/debug.ts

@@ -9,7 +9,6 @@
 
 import fs from "fs";
 import path from "path";
-import { openDb, getApiId } from "../lib/db";
 import { PARKS } from "../lib/parks";
 import { scrapeMonthRaw } from "../lib/scrapers/sixflags";
 
@@ -52,16 +51,6 @@ async function main() {
   const month = parseInt(monthStr);
   const day = parseInt(dayStr);
 
-  const db = openDb();
-  const apiId = getApiId(db, park.id);
-  db.close();
-
-  if (apiId === null) {
-    console.error(`No API ID found for ${park.name} — run: npm run discover`);
-    process.exit(1);
-  }
-
-  // Collect all output so we can write it to a file as well
   const lines: string[] = [];
   const out = (...args: string[]) => {
     const line = args.join(" ");
@@ -70,13 +59,13 @@ async function main() {
   };
 
   out(`Park    : ${park.name} (${park.id})`);
-  out(`API ID  : ${apiId}`);
+  out(`API ID  : ${park.apiId}`);
   out(`Date    : ${dateStr}`);
   out(`Fetched : ${new Date().toISOString()}`);
   out("");
   out(`Fetching ${year}-${String(month).padStart(2, "0")} from API...`);
 
-  const raw = await scrapeMonthRaw(apiId, year, month);
+  const raw = await scrapeMonthRaw(park.apiId, year, month);
 
   const targetDate = `${String(month).padStart(2, "0")}/${String(day).padStart(2, "0")}/${year}`;
   const dayData = raw.dates.find((d) => d.date === targetDate);