Separate WhatsApp auth from daemon into standalone script

- Add src/auth.ts for interactive QR code authentication
- Add `npm run auth` script
- Update setup skill for current Node.js architecture
- Daemon (src/index.ts) now only uses stored credentials

Auth is run during setup; daemon assumes credentials exist and
shows macOS notification if re-auth is needed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package-lock.json

@@ -12,11 +12,13 @@
         "@whiskeysockets/baileys": "^7.0.0-rc.9",
         "better-sqlite3": "^11.8.1",
         "pino": "^9.6.0",
-        "pino-pretty": "^13.0.0"
+        "pino-pretty": "^13.0.0",
+        "qrcode-terminal": "^0.12.0"
       },
       "devDependencies": {
         "@types/better-sqlite3": "^7.6.12",
         "@types/node": "^22.10.0",
+        "@types/qrcode-terminal": "^0.12.2",
         "tsx": "^4.19.0",
         "typescript": "^5.7.0"
       },
@@ -1175,6 +1177,13 @@
         "undici-types": "~6.21.0"
       }
     },
+    "node_modules/@types/qrcode-terminal": {
+      "version": "0.12.2",
+      "resolved": "https://registry.npmjs.org/@types/qrcode-terminal/-/qrcode-terminal-0.12.2.tgz",
+      "integrity": "sha512-v+RcIEJ+Uhd6ygSQ0u5YYY7ZM+la7GgPbs0V/7l/kFs2uO4S8BcIUEMoP7za4DNIqNnUD5npf0A/7kBhrCKG5Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@whiskeysockets/baileys": {
       "version": "7.0.0-rc.9",
       "resolved": "https://registry.npmjs.org/@whiskeysockets/baileys/-/baileys-7.0.0-rc.9.tgz",
@@ -1980,6 +1989,14 @@
         "node": ">=20"
       }
     },
+    "node_modules/qrcode-terminal": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/qrcode-terminal/-/qrcode-terminal-0.12.0.tgz",
+      "integrity": "sha512-EXtzRZmC+YGmGlDFbXKxQiMZNwCLEO6BANKXG4iCtSIM0yqc/pappSx3RIKr4r0uh5JsBckOXeKrB3Iz7mdQpQ==",
+      "bin": {
+        "qrcode-terminal": "bin/qrcode-terminal.js"
+      }
+    },
     "node_modules/quick-format-unescaped": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/quick-format-unescaped/-/quick-format-unescaped-4.0.4.tgz",