Move fleet retention and concurrency controls into Settings

Persist settings in SQLite, import legacy environment values once, and apply changes to cleanup and deployment queues without restarting.

Closes #51

src/lib/server/config.ts

@@ -15,12 +15,6 @@ function num(name: string, fallback: number): number {
     return n;
 }
 
-function positiveInt(name: string, fallback: number): number {
-    const value = num(name, fallback);
-    if (!Number.isSafeInteger(value) || value < 1) throw new Error(`env ${name} must be a positive integer`);
-    return value;
-}
-
 export const config = {
     serversRoot: req('SERVERS_ROOT', '/root/zombies/t5'),
     t6ServersRoot: env.T6_SERVERS_ROOT ?? join(dirname(req('SERVERS_ROOT', '/root/zombies/t5')), 't6'),
@@ -38,9 +32,6 @@ export const config = {
     // Cleared per-beta on promote/rollback.
     betaArchiveDir: req('BETA_ARCHIVE_DIR', '/root/zombies/beta-archive'),
     dbPath: req('DB_PATH', './data/cherry.db'),
-    deployKeepDays: num('DEPLOY_KEEP_DAYS', 7),
-    restartConcurrency: positiveInt('DEPLOYMENT_RESTART_CONCURRENCY', 1),
-    createConcurrency: positiveInt('DEPLOYMENT_CREATE_CONCURRENCY', 1),
     httpTimeoutMs: num('HTTP_TIMEOUT_MS', 10_000),
     komodo: {
         address: env.KOMODO_ADDRESS ?? '',