feat: add scoped theme builder system with per-route, per-module, and multi-site support

- Add theme_scopes and theme_scope_values database tables for scoped themes
- Implement theme resolver engine with inheritance: global > site > module > route
- Add module detection for 20+ routes (shop, guilds, radio, news, etc.)
- Create admin UI at /admin/theme-builder with scope tree and color editor
- Add ScopedThemeVars component for injecting scoped CSS via data-attributes
- Add ThemeScopeDetector client component for runtime module/route detection
- Add site-resolver for multi-site domain detection
- Add /api/themes/export endpoint (JSON, CSS, variables formats)
- Add /api/themes/export/embed.js for external integration widget
- Add server actions for full CRUD on scopes and theme values
- Add admin nav link and EN/NL translations

src/db/schema.ts

@@ -2583,3 +2583,45 @@ export const YoutubePlaylists = mysqlTable(
 		),
 	],
 );
+
+// ─── Theme Builder: scoped theme system ──────────────────────────────────────
+
+export const ThemeScope = mysqlTable("theme_scopes", {
+	id: bigint("id", { mode: "bigint", unsigned: true })
+		.autoincrement()
+		.primaryKey()
+		.notNull(),
+	name: varchar("name", { length: 100 }).notNull(),
+	type: mysqlEnum("type", ["global", "site", "module", "route"]).notNull(),
+	parentId: bigint("parent_id", { mode: "bigint", unsigned: true }),
+	siteDomain: varchar("site_domain", { length: 255 }),
+	routePath: varchar("route_path", { length: 255 }),
+	moduleId: varchar("module_id", { length: 100 }),
+	isActive: boolean("is_active").notNull().default(true),
+	sortOrder: int("sort_order").notNull().default(0),
+	createdAt: datetime("created_at").notNull(),
+	updatedAt: datetime("updated_at").notNull(),
+});
+
+export const ThemeScopeValue = mysqlTable(
+	"theme_scope_values",
+	{
+		id: bigint("id", { mode: "bigint", unsigned: true })
+			.autoincrement()
+			.primaryKey()
+			.notNull(),
+		scopeId: bigint("scope_id", { mode: "bigint", unsigned: true }).notNull(),
+		settingKey: varchar("setting_key", { length: 100 }).notNull(),
+		settingVal: varchar("setting_val", { length: 255 }).notNull(),
+		mode: mysqlEnum("mode", ["light", "dark"]).notNull().default("light"),
+		createdAt: datetime("created_at").notNull(),
+		updatedAt: datetime("updated_at").notNull(),
+	},
+	(t) => [
+		uniqueIndex("theme_scope_values_unique").on(
+			t.scopeId,
+			t.settingKey,
+			t.mode,
+		),
+	],
+);