feat: add builds concurrency management for servers

- Introduced a new `BuildsConcurrency` component to manage the number of concurrent builds for both local and remote servers, gated by license validity.
- Implemented backend logic to resolve effective builds concurrency based on server settings and organization licenses.
- Added unit tests for concurrency resolution logic to ensure correct behavior under various licensing scenarios.
- Updated database schema to include `buildsConcurrency` field for servers and web server settings.
- Refactored deployment queue to support in-memory job processing with configurable concurrency limits.

This feature enhances deployment flexibility and control for enterprise users.

packages/server/src/db/schema/server.ts

@@ -41,6 +41,7 @@ export const server = pgTable("server", {
 		.notNull()
 		.$defaultFn(() => generateAppName("server")),
 	enableDockerCleanup: boolean("enableDockerCleanup").notNull().default(false),
+	buildsConcurrency: integer("buildsConcurrency").notNull().default(1),
 	createdAt: text("createdAt").notNull(),
 	organizationId: text("organizationId")
 		.notNull()
@@ -182,6 +183,11 @@ export const apiUpdateServer = createSchema
 		enableDockerCleanup: z.boolean().default(true),
 	});
 
+export const apiUpdateServerBuildsConcurrency = z.object({
+	serverId: z.string().min(1),
+	buildsConcurrency: z.number().int().min(1).max(20),
+});
+
 export const apiUpdateServerMonitoring = createSchema
 	.pick({
 		serverId: true,

packages/server/src/db/schema/web-server-settings.ts

@@ -1,5 +1,12 @@
 import { relations } from "drizzle-orm";
-import { boolean, jsonb, pgTable, text, timestamp } from "drizzle-orm/pg-core";
+import {
+	boolean,
+	integer,
+	jsonb,
+	pgTable,
+	text,
+	timestamp,
+} from "drizzle-orm/pg-core";
 import { createInsertSchema } from "drizzle-zod";
 import { nanoid } from "nanoid";
 import { z } from "zod";
@@ -98,6 +105,8 @@ export const webServerSettings = pgTable("webServerSettings", {
 		}),
 	// Deployment Configuration (self-hosted only)
 	remoteServersOnly: boolean("remoteServersOnly").notNull().default(false),
+	// Concurrent builds on the local web server (enterprise-gated to > 1)
+	buildsConcurrency: integer("buildsConcurrency").notNull().default(1),
 	// Auth Configuration (self-hosted only)
 	enforceSSO: boolean("enforceSSO").notNull().default(false),
 	// Cache Cleanup Configuration
@@ -161,6 +170,11 @@ export const apiUpdateWebServerSettings = createSchema.partial().extend({
 	cleanupCacheOnCompose: z.boolean().optional(),
 	remoteServersOnly: z.boolean().optional(),
 	enforceSSO: z.boolean().optional(),
+	buildsConcurrency: z.number().int().min(1).max(20).optional(),
+});
+
+export const apiUpdateWebServerBuildsConcurrency = z.object({
+	buildsConcurrency: z.number().int().min(1).max(20),
 });
 
 export const apiAssignDomain = z