Accept feedback modal analytics events and insert into Supabase.

FAULT-TOLERANT: Never returns 422 errors. Accepts partial payloads. Analytics failures are silent and never block frontend behavior.

This is a fire-and-forget endpoint with minimal logic:

• No authentication required
• No deduplication
• No analytics calculations
• No data transformation
• Never raises HTTPException

Args: payload: Dictionary containing event data (flexible structure)

Returns: Always HTTP 200 with { "status": "ok" }