Update OpenAPI schema

[dotto-api-schema-updater]

This PR updates the OpenAPI schema from dotto-typespec.

Triggered by: fun-dotto/dotto-typespec@397b030

[Copilot]

Pull request overview

This PR introduces a basic “User Service” vertical slice (OpenAPI spec → generated server types → Gin wiring → handler/service/repository → GORM model + migration) to support fetching a user by ID and creating/updating a user.

Changes:

• Added GET /v1/users/{id} and POST /v1/users/{id} to the OpenAPI spec and generated Gin + strict server bindings.
• Implemented handler/service/repository layers for user detail and upsert.
• Added a GORM User model and updated migrations to create the users table.

Reviewed changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
openapi/openapi.yaml	Defines the User Service API contract and schemas.
openapi/config.yaml	oapi-codegen configuration for Gin + strict server generation.
generated/api.gen.go	Generated API types and handler registration from the OpenAPI spec.
cmd/server/main.go	Wires DB, OpenAPI request validation, and registers generated routes/handlers.
internal/handler/user.go	Introduces the HTTP handler struct with a UserService dependency.
internal/handler/detail.go	Implements the strict-server UsersV1Detail handler.
internal/handler/upsert.go	Implements the strict-server UsersV1Upsert handler.
internal/handler/converter.go	Converts between domain models and generated API models.
internal/service/user.go	Adds a service layer and repository interface for user operations.
internal/repository/user.go	Implements GORM-backed user persistence and lookup.
internal/domain/user.go	Adds the domain User model.
internal/domain/errors.go	Adds a domain-level ErrNotFound.
internal/database/user.go	Adds the GORM User model and domain conversion helpers.
internal/database/migrate.go	Updates automigration to include the User model.
go.mod	Adds oapi-codegen runtime dependency and pins the oapi-codegen tool.
go.sum	Records new dependency checksums.

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[kantacky]

LGTM