Add builder service: scaffold, ASC API, devices UI, fastlane profile manager

Phase 1-3 of the builder subsystem on the Mac mini:
- Express + SQLite + sessions scaffolding, LAN-only service on port 3090
- App Store Connect JWT client (ES256 signing, devices/profiles/bundleIds)
- Device management UI with Apple-side registration
- Fastlane sigh wrapper with profile cache + auto-install to ~/Library/
- launchd plist + deploy script for Mac mini supervision

builder/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "ios-appstore-builder",
+  "version": "1.0.0",
+  "description": "Mac mini build service for the iOS App Store: ASC integration, fastlane profile management, server-side xcodebuild",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js",
+    "dev": "node --watch src/server.js"
+  },
+  "dependencies": {
+    "better-sqlite3": "^11.7.0",
+    "express": "^4.21.0",
+    "express-session": "^1.18.1",
+    "multer": "^1.4.5-lts.1",
+    "uuid": "^10.0.0"
+  }
+}