#397 feat: add Instagram connector support

Summary

• Add "instagram" to SUPPORTED_TOOLKITS and ALLOWED_ARTIST_CONNECTORS
• Add COMPOSIO_INSTAGRAM_AUTH_CONFIG_ID auth config for Instagram OAuth
• Fix authConfigs bug: moved auth config construction above both return paths so custom OAuth configs apply regardless of account_id presence
• Part of REC-49: Add Instagram Connector (Artist-Level)

Test plan

• Set COMPOSIO_INSTAGRAM_AUTH_CONFIG_ID in env
• Verify GET /api/connectors returns Instagram in artist connector list
• Verify POST /api/connectors/authorize with connector: "instagram" includes auth config
• Verify TikTok connector still works (regression)

🤖 Generated with Claude Code

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Summary by cubic

Add an artist-level Instagram connector with custom OAuth, and apply authConfigs with or without account_id (REC-49).

• New Features

  • Added "instagram" to SUPPORTED_TOOLKITS and ALLOWED_ARTIST_CONNECTORS.
  • Enabled Instagram OAuth via COMPOSIO_INSTAGRAM_AUTH_CONFIG_ID.

• Bug Fixes

  • Built authConfigs before all return paths so custom OAuth applies regardless of account_id; updated tests to include Instagram.

Summary by CodeRabbit

• New Features

  • Instagram connector is now available in the Composio toolkit library for creating and managing sessions
  • Instagram is now supported and recognized as an allowed artist connector

• Improvements

  • Enhanced OAuth authentication configuration handling for custom OAuth providers to ensure proper support for Instagram, TikTok, and other platforms