feat(server): add REST-API endpoints for inventory sync & CRUD
server/src/main/kotlin/.../routes/InventoryRoutes.kt:
- GET /api/inventory: returns full inventory as JSON
- PUT /api/inventory: full-sync replaces entire server inventory
server/src/main/kotlin/.../plugins/StatusPages.kt:
- Structured error handling via Ktor StatusPages plugin
- BadRequestException, SerializationException, IllegalArgumentException → 400
- Unhandled exceptions → 500 with logging
server/src/main/kotlin/.../plugins/CallLogging.kt:
- Request logging via Ktor CallLogging plugin (INFO level)
server/src/main/kotlin/.../model/ErrorResponse.kt:
- Serializable error response DTO (status + message)
server/src/main/kotlin/.../plugins/Routing.kt:
- Health endpoint moved from /health to /api/health
- Inventory routes mounted under /api/inventory
server/src/main/kotlin/.../Application.kt:
- Added configurePlugins() for testability (DB init separate)
- StatusPages and CallLogging plugins configured
server/src/test/.../ApplicationTest.kt:
- 8 endpoint tests using Ktor TestApplication with in-memory H2
- Tests: health, 404, empty GET, PUT valid, PUT+GET roundtrip,
invalid JSON → 400, data replacement, JSON content type
Closes #42
5974144621