Add multi-server blueprint collections and atomic launches

src/lib/server/fleet/create.ts

@@ -59,7 +59,7 @@ export interface CreateServerInput {
  * the servers table. Caps at 20 to stay inside the port range — with 20 total
  * ports across the whole fleet, no one map can hold more than that.
  */
-function nextLobbyNumber(baseName: string): number | null {
+export function nextLobbyNumber(baseName: string, additionalNames: string[] = []): number | null {
     const rows = db()
         .prepare(`SELECT name FROM servers WHERE name LIKE ? UNION
             SELECT j.server AS name FROM server_creation_jobs j JOIN server_deployments d ON d.id = j.deployment_id
@@ -67,7 +67,7 @@ function nextLobbyNumber(baseName: string): number | null {
         .all(`${baseName}_%`) as Array<{ name: string }>;
     const taken = new Set<number>();
     const prefix = `${baseName}_`;
-    for (const r of rows) {
+    for (const r of [...rows, ...additionalNames.map(name => ({ name }))]) {
         if (!r.name.startsWith(prefix)) continue;
         const tail = r.name.slice(prefix.length);
         if (/^\d+$/.test(tail)) taken.add(Number.parseInt(tail, 10));
@@ -83,13 +83,13 @@ function nextLobbyNumber(baseName: string): number | null {
  * from the DB (which EC controls end-to-end under the new naming scheme, so
  * the DB is authoritative — no need to ask Komodo).
  */
-function nextAvailablePort(): number | null {
+export function nextAvailablePort(additionalPorts: number[] = []): number | null {
     const rows = db()
         .prepare(`SELECT game_port FROM servers WHERE game_port IS NOT NULL UNION
             SELECT j.port AS game_port FROM server_creation_jobs j JOIN server_deployments d ON d.id = j.deployment_id
             WHERE d.state IN ('queued', 'running', 'awaiting-health')`)
         .all() as Array<{ game_port: number }>;
-    const taken = new Set(rows.map((r) => r.game_port));
+    const taken = new Set([...rows.map((r) => r.game_port), ...additionalPorts]);
     for (let p = config.portRange.min; p <= config.portRange.max; p++) {
         if (!taken.has(p)) return p;
     }