feat(desktop): add data-driven theme system

desktop/scripts/apply-flavor.mjs

@@ -0,0 +1,68 @@
+#!/usr/bin/env node
+// Stage or clear a flavor into resources/ before packaging.
+//
+// A flavor lives in flavors/<name>/ and may contain:
+//   app-config.json    → copied to resources/app-config.json
+//   themes/<id>/...     → copied to resources/themes/<id>/...
+//
+// Usage:
+//   node scripts/apply-flavor.mjs <name>   # stage flavors/<name> into resources/
+//   node scripts/apply-flavor.mjs --clear  # remove staged app-config.json + themes/
+//
+// The standard build ships neither app-config.json nor resources/themes, so it
+// keeps the default theme and free switching. Always --clear after a flavored
+// build so the repo's resources/ stays clean.
+
+import fs from 'node:fs'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const here = path.dirname(fileURLToPath(import.meta.url))
+const root = path.resolve(here, '..')
+const resourcesDir = path.join(root, 'resources')
+const configFile = path.join(resourcesDir, 'app-config.json')
+const resThemesDir = path.join(resourcesDir, 'themes')
+
+function rimraf(target) {
+  fs.rmSync(target, { recursive: true, force: true })
+}
+
+function copyDir(src, dest) {
+  fs.mkdirSync(dest, { recursive: true })
+  for (const entry of fs.readdirSync(src, { withFileTypes: true })) {
+    const s = path.join(src, entry.name)
+    const d = path.join(dest, entry.name)
+    if (entry.isDirectory()) copyDir(s, d)
+    else fs.copyFileSync(s, d)
+  }
+}
+
+function clear() {
+  rimraf(configFile)
+  rimraf(resThemesDir)
+  console.log('[flavor] cleared resources/app-config.json and resources/themes')
+}
+
+function apply(name) {
+  const flavorDir = path.join(root, 'flavors', name)
+  if (!fs.existsSync(flavorDir)) {
+    console.error(`[flavor] no such flavor: flavors/${name}`)
+    process.exit(1)
+  }
+  clear()
+  const srcConfig = path.join(flavorDir, 'app-config.json')
+  if (fs.existsSync(srcConfig)) {
+    fs.mkdirSync(resourcesDir, { recursive: true })
+    fs.copyFileSync(srcConfig, configFile)
+    console.log(`[flavor] staged app-config.json from flavors/${name}`)
+  }
+  const srcThemes = path.join(flavorDir, 'themes')
+  if (fs.existsSync(srcThemes)) {
+    copyDir(srcThemes, resThemesDir)
+    console.log(`[flavor] staged themes from flavors/${name}`)
+  }
+}
+
+const arg = process.argv[2]
+if (!arg || arg === '--clear') clear()
+else apply(arg)