Squashed 'l1/' content from commit 670aa58

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.env.example

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+# L1 Server Configuration
+
+# PostgreSQL password (REQUIRED - no default)
+POSTGRES_PASSWORD=changeme-generate-with-openssl-rand-hex-16
+
+# Admin token for purge operations (REQUIRED - no default)
+# Generate with: openssl rand -hex 32
+ADMIN_TOKEN=changeme-generate-with-openssl-rand-hex-32
+
+# L1 host IP/hostname for GPU worker cross-VPC access
+L1_HOST=your-l1-server-ip
+
+# This L1 server's public URL (sent to L2 when publishing)
+L1_PUBLIC_URL=https://l1.artdag.rose-ash.com
+
+# L2 server URL (for authentication and publishing)
+L2_SERVER=https://artdag.rose-ash.com
+
+# L2 domain for ActivityPub actor IDs (e.g., @user@domain)
+L2_DOMAIN=artdag.rose-ash.com