Implement paginated endpoint to list users and their organizations created by master org through the platform exchange flow.
## Changes
- Create shared/api/platform/platformModels.ts with Zod schemas for query params and response types
- Implement handleListPlatformUsers handler with pagination support (limit/offset)
- Add expand=organizations query param to fetch up to 100 orgs per user
- Clean org slugs by removing master org prefix in responses
- Create honoPlatformRouter and register it in Hono app at /v1/platform/users
- Export platform types from shared package index
- Apply biome linting fixes to platformRouter.ts (let -> const conversions)
## Features
✅ Paginated results (limit 1-100, default 10)
✅ Offset-based pagination matching handleBatchCustomers pattern
✅ Optional organizations expansion
✅ Filters by organizations.created_by = ctx.org_id
✅ Removes master org slug prefix from org responses
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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