Add create endpoint for PartnerRequest and make publish/cancel idempotent

[Copilot]

Implements POST /partner_request/{type} for creating partner requests with dual-table insertion, removes next_status endpoint, and makes publish/cancel operations idempotent.

Changes

Create endpoint (POST /partner_request/{type})

• Discriminated union schema validates request by type field (ride_hailing, commute)
• Manager create() methods atomically insert base PartnerRequest + type-specific content table
• Transaction rollback on failure

# Request body discriminated by type field
{
  "type": "ride_hailing",
  "title": "...",
  "route": [...],
  "ride_hailing_preference": {...}
}

Idempotent publish/cancel

• PUT /partner_request/{pr_id}/publish - returns existing if already JOINABLE
• PUT /partner_request/{pr_id}/cancel - returns existing if already CANCELLED
• Applied to both route handlers and manager methods

Removed

• PUT /partner_request/{pr_id}/status/next endpoint

Files Changed

• main/schemas/partner_request/trip/create.py - Request schemas with discriminated union
• main/managers/partner_request/trip/{ride_hailing,commute}.py - Implemented create() with dual-table insertion
• main/managers/partner_request/base.py - Idempotent publish/cancel in managers
• main/routes.py - New create endpoint, removed next_status, idempotent handlers
• tests/test_pr/test_create_pr.py - Test coverage for all changes

Original prompt

Add create PartnerRequest endpoint.
Notes:

• PartnerRequest has a varieity of types, each type has their own content table. Which means create a PartnerRequest will insert a row both in base table and the type-specific content table. This is already implemented in specific PartnerRequest manager like RideHailingPRManager, CommutePRManager (but still requires some adjustion).
• the endpoints should be POST /partner_request/{type}
• Add test unit for the endpoint

And by the way:

• remove next_status endpoint
• make publish_partner_request, cancel_partner_request idempotent (if status match the target status)

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