feat: fix and extend working with GET, add accept headers

[andboson]

No description provided.

[Copilot]

Pull request overview

This PR updates the mock server’s request-matching model to support optional matching fields, extends GET matching to incorporate query parameters, and adds a defaulting behavior for response Content-Type based on the request’s Accept header.

Changes:

• Switched Expectation.Method, Expectation.Path, and Expectation.Request from string to *string with omitempty tags.
• Added GET query-parameter matching by encoding r.URL.Query() for matching.
• Added “smart” Content-Type behavior when no response headers are provided, and updated docs/tests accordingly.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
internal/models/expectation.go	Makes matching fields optional and adds GET query normalization logic for request matching.
internal/services/server/mocks_handler.go	Uses query encoding for GET matching and derives response Content-Type from request Accept in some cases.
internal/services/server/mocks_handler_test.go	Updates expectations to pointer fields and adds GET query matching test cases.
internal/services/server/server_test.go	Updates server tests for pointer-based Expectation fields.
internal/services/server/expectation_handler_test.go	Updates assertion to dereference pointer Path.
internal/models/expectation_test.go	Updates model tests for pointer fields and adds GET query matching scenarios.
internal/config/config_test.go	Updates config tests to handle pointer fields after unmarshalling.
README.md	Documents GET query matching and the new Content-Type behavior.