feat(affine): add SMTP config, AFFINE_SERVER_EXTERNAL_URL; remove blinko dir

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

affine/.env.example

@@ -3,3 +3,9 @@ NETWORK_NAME=falcon_network
 DB_USERNAME=affine
 DB_PASSWORD=change_me
 DB_DATABASE=affine
+MAILER_HOST=mailpit
+MAILER_PORT=1025
+MAILER_USER=affine
+MAILER_PASSWORD=affine
+MAILER_SENDER=affine@example.com
+MAILER_IGNORE_TLS=true

affine/compose.yml

@@ -6,6 +6,7 @@ services:
     environment:
       REDIS_SERVER_HOST: redis
       DATABASE_URL: postgresql://${DB_USERNAME}:${DB_PASSWORD}@postgres:5432/${DB_DATABASE:-affine}
+      AFFINE_SERVER_EXTERNAL_URL: https://${TRAEFIK_HOST}
       AFFINE_INDEXER_ENABLED: "false"
     volumes:
       - ../.data/affine/storage:/root/.affine/storage