chore(seo-data): install/make/doctor wiring + gitleaks allowlist for token store

.env.example

@@ -4,3 +4,12 @@
 # Used by: lib/toggle-external.sh enable|disable magic
 # Get a key at: https://21st.dev/magic (dashboard → API keys)
 MAGIC_API_KEY=your_21st_dev_magic_api_key_here
+
+# ── Google SEO data layer (lib/seo-data) — used by /seo FULL ──
+# OAuth Desktop client: GCP console → APIs & Services → Credentials → OAuth client (Desktop).
+# Scope requested at consent: webmasters.readonly. One-time setup: make seo-connect
+GOOGLE_OAUTH_CLIENT_ID=<your-client-id.apps.googleusercontent.com>
+GOOGLE_OAUTH_CLIENT_SECRET=<your-client-secret>
+# CrUX + PageSpeed API key (GCP console → Credentials → API key, restricted to those APIs).
+# Get it: https://developer.chrome.com/docs/crux/api
+CRUX_API_KEY=<your-crux-api-key>