feat(docs): passkey registration and authentication (#46340)

Adds documentation for Passkey registration and authentication flows.

apps/docs/spec/cli_v1_config.yaml

@@ -1439,6 +1439,50 @@ parameters:
       - name: 'Auth Multi-Factor Authentication'
         link: 'https://supabase.com/docs/guides/auth/auth-mfa'
 
+  - id: 'auth.passkey.enabled'
+    title: 'auth.passkey.enabled'
+    tags: ['auth']
+    required: false
+    default: 'false'
+    description: |
+      Enable passkey sign-in and registration. Requires `auth.webauthn` to be configured.
+    links:
+      - name: 'Sign in with Passkey'
+        link: 'https://supabase.com/docs/guides/auth/passkeys'
+
+  - id: 'auth.webauthn.rp_display_name'
+    title: 'auth.webauthn.rp_display_name'
+    tags: ['auth']
+    required: false
+    default: ''
+    description: |
+      Human-readable name for the WebAuthn relying party shown to users during the passkey ceremony. Required when `auth.passkey.enabled` is `true`.
+    links:
+      - name: 'Sign in with Passkey'
+        link: 'https://supabase.com/docs/guides/auth/passkeys'
+
+  - id: 'auth.webauthn.rp_id'
+    title: 'auth.webauthn.rp_id'
+    tags: ['auth']
+    required: false
+    default: ''
+    description: |
+      WebAuthn relying party identifier. Must be a registrable suffix of every origin in `auth.webauthn.rp_origins` (for example `example.com` for `https://app.example.com`). Required when `auth.passkey.enabled` is `true`.
+    links:
+      - name: 'Sign in with Passkey'
+        link: 'https://supabase.com/docs/guides/auth/passkeys'
+
+  - id: 'auth.webauthn.rp_origins'
+    title: 'auth.webauthn.rp_origins'
+    tags: ['auth']
+    required: false
+    default: '[]'
+    description: |
+      List of origins your app is served from. The browser refuses the WebAuthn ceremony if the page origin is not in this list. Required when `auth.passkey.enabled` is `true`.
+    links:
+      - name: 'Sign in with Passkey'
+        link: 'https://supabase.com/docs/guides/auth/passkeys'
+
   - id: 'auth.sessions.timebox'
     title: 'auth.sessions.timebox'
     tags: ['auth']