feat: add api_integration tracking to Dify and n8n integrations

[hwennnn]

Summary

• Adds api_integration field to the request body payload for both Dify ("dify") and n8n ("n8n") integrations
• Enables usage attribution in PostHog so we can track which integration surface API calls originate from
• Matches the backend schema where request_origin is 'api' and api_integration specifies the client (per London's implementation in mino)

Changes

• dify/tools/base.py — Added "api_integration": "dify" to _build_automation_payload(), covering run, run-async, and run-sse endpoints
• n8n/nodes/Tinyfish/GenericFunctions.ts — Added api_integration: 'n8n' to buildAutomationPayload(), covering all automation requests including SSE

Test plan

• Verify Dify plugin sends api_integration: "dify" in request body for all automation endpoints
• Verify n8n node sends api_integration: "n8n" in request body for all automation endpoints
• Confirm api_integration appears in PostHog run_completed events after backend processes these requests

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 100f422e-91e5-40b0-866a-64bb2e9bdb74

📥 Commits

Reviewing files that changed from the base of the PR and between 4e53a9c and 7ddb7f3.

📒 Files selected for processing (2)

• dify/tools/base.py
• n8n/nodes/Tinyfish/GenericFunctions.ts

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📝 Walkthrough

Walkthrough

The changes add an api_integration field to automation payloads across two integration implementations. In the Dify integration (dify/tools/base.py), the field is set to "dify" within the _build_automation_payload method. In the n8n integration (n8n/nodes/Tinyfish/GenericFunctions.ts), the field is set to "n8n" in the automation payload construction. These additions ensure that each integration identifies itself in the payload it generates.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding api_integration tracking to both Dify and n8n integrations.
Description check	✅ Passed	The description is well-related to the changeset, providing clear context about why the changes were made and what files were modified.

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