feat: add integrations

Signed-off-by: kjuulh <contact@kjuulh.io>

.env.example

@@ -4,5 +4,21 @@ FOREST_SERVER_URL=http://localhost:4040
 # HTTP port (default: 3000)
 # PORT=3001
 
-# PostgreSQL connection (optional - omit for in-memory sessions)
-# DATABASE_URL=postgresql://forageuser:foragepassword@localhost:5432/forage
+# PostgreSQL connection (required for integrations, optional for sessions)
+DATABASE_URL=postgresql://forageuser:foragepassword@localhost:5433/forage
+
+# Encryption key for integration configs at rest (32+ chars recommended)
+# INTEGRATION_ENCRYPTION_KEY=your-secret-key-here
+
+# Slack OAuth (for Slack integration setup)
+# SLACK_CLIENT_ID=your-slack-client-id
+# SLACK_CLIENT_SECRET=your-slack-client-secret
+
+# Service token (PAT) for forest-server notification listener auth
+# FORAGE_SERVICE_TOKEN=forage-secret
+
+# NATS JetStream for durable notification delivery (optional, falls back to direct dispatch)
+# NATS_URL=nats://localhost:4223
+
+# Base URL for OAuth callbacks (default: http://localhost:3000)
+# FORAGE_BASE_URL=https://forage.sh