feat(work-apps): add Slack Work App integration

.env.example

@@ -43,12 +43,18 @@ OPENAI_API_KEY=
 GOOGLE_GENERATIVE_AI_API_KEY=
 
 # ============ THIRD PARTY SERVICES ============
-# Nango (for OAuth integrations)
+# Nango (for MCP OAuth integrations)
 NANGO_SECRET_KEY=
 NANGO_SERVER_URL=http://localhost:3050
 PUBLIC_NANGO_SERVER_URL=http://localhost:3050
 PUBLIC_NANGO_CONNECT_BASE_URL=http://localhost:3051
 
+# Nango for Slack App (separate from MCP integrations)
+# Optional: Use a different Nango environment to isolate Slack auth from MCP auth
+# If not set, falls back to NANGO_SECRET_KEY
+# NANGO_SLACK_SECRET_KEY=
+NANGO_SLACK_INTEGRATION_ID=
+
 SIGNOZ_URL=http://localhost:3080
 PUBLIC_SIGNOZ_URL=http://localhost:3080
 SIGNOZ_API_KEY=
@@ -111,3 +117,13 @@ INKEEP_AGENTS_MANAGE_API_BYPASS_SECRET=test-bypass-secret-for-ci
 # GitHub App name as shown in the URL: https://github.com/apps/{app-name}
 # Used to generate the installation URL for GitHub App
 # GITHUB_APP_NAME=your-github-app-name
+
+# ============ SLACK APP CONFIGURATION ============
+# Get credentials from: https://api.slack.com/apps → Your App → Basic Information
+# SLACK_CLIENT_ID=
+# SLACK_CLIENT_SECRET=
+# SLACK_SIGNING_SECRET=
+# Your public URL for OAuth redirect (use ngrok for local dev)
+# SLACK_APP_URL=https://your-app.ngrok.app
+# UI URL for redirect after OAuth completes
+# INKEEP_AGENTS_MANAGE_UI_URL=http://localhost:3000