feat(auth): add Supabase passkey support + stabilize backend Flow startup

.env.example

@@ -13,6 +13,19 @@ SUPABASE_SERVICE_KEY=generate-with-script-above
 # --- Supabase Auth (GoTrue) ---
 API_EXTERNAL_URL=http://localhost:9999
 SITE_URL=http://localhost:5173
+VITE_SUPABASE_URL=http://localhost:54321
+VITE_PASSKEY_RP_ID=localhost
+VITE_PASSKEY_RP_NAME=FlowIndex Developer Portal
+
+# --- OAuth Providers (optional, for GitHub/Google login) ---
+GOTRUE_EXTERNAL_GITHUB_ENABLED=true
+GOTRUE_EXTERNAL_GITHUB_CLIENT_ID=your-github-oauth-app-client-id
+GOTRUE_EXTERNAL_GITHUB_SECRET=your-github-oauth-app-client-secret
+GOTRUE_EXTERNAL_GITHUB_REDIRECT_URI=http://localhost:9999/callback
+GOTRUE_EXTERNAL_GOOGLE_ENABLED=true
+GOTRUE_EXTERNAL_GOOGLE_CLIENT_ID=your-google-oauth-client-id
+GOTRUE_EXTERNAL_GOOGLE_SECRET=your-google-oauth-client-secret
+GOTRUE_EXTERNAL_GOOGLE_REDIRECT_URI=http://localhost:9999/callback
 
 # --- SMTP (optional, for email auth) ---
 # GOTRUE_SMTP_HOST=smtp.resend.com
@@ -27,6 +40,14 @@ SITE_URL=http://localhost:5173
 # SVIX_AUTH_TOKEN=
 # SVIX_SERVER_URL=http://svix:8071
 
+# --- Flow Access Nodes (optional override) ---
+# FLOW_ACCESS_NODES=access-001.mainnet28.nodes.onflow.org:9000,access.mainnet.nodes.onflow.org:9000
+# FLOW_HISTORIC_ACCESS_NODES=access-001.mainnet28.nodes.onflow.org:9000,access.mainnet.nodes.onflow.org:9000
+
+# --- Flow Keys (custodial key management) ---
+ENCRYPTION_KEY=generate-a-64-char-hex-string
+LILICO_API_KEY=your-lilico-api-key
+
 # --- Supabase Studio (basic auth) ---
 STUDIO_USER=admin
 STUDIO_PASSWORD=change-me-to-a-strong-password