Add links to responses: schema links to jump to linked page, body links to fill in fields and issue requests

[t1]

Add links to the responses: in the schema to jump to the linked page, and in the body to also fill in the field and maybe issue the request.

[t1]

Agent: starting work

Type: Feature
Summary: Add support for OpenAPI 3.0 Response Links. When a response defines Links (via links in the response object), the UI will render them in the response schema view as clickable navigation elements, and in the "Try it out" response body as clickable values that navigate to the linked operation and pre-fill its parameters.

Design decisions:

• Use the standard OpenAPI 3.0 Links mechanism (response.links) — no heuristic guessing
• Schema view: render links as a dedicated section below the response schema, showing the link name, description, and a clickable element that navigates to the target operation
• Body view: after a response is received, detect values that correspond to link parameters and make them clickable — clicking navigates to the target operation and fills in the parameter
• No auto-request on body link click (the issue says "maybe issue the request" — keeping it explicit for now, user clicks Send after navigating)
• Links reference target operations via operationId; we'll resolve these to the correct path/method for navigation
• Demo app: add Links to PetResource responses (e.g., GET /pets/{id} → links to GET /owners/{id} via ownerId, GET /pets/{petId}/visits via petId)

Acceptance criteria:

• OpenAPI Links defined on responses are rendered in the response schema view
• Clicking a schema link navigates to the target operation in the tree
• After "Try it out", response body values corresponding to link parameters become clickable
• Clicking a body link navigates to the target operation and fills in the path/query parameters
• Demo app exercises the feature with cross-resource links (Pet→Owner, Pet→Visits)
• All behavior covered by browser tests

Files:

• core/.../generator/OperationFragmentGenerator.java — render links in schema and response fragments
• core/.../generator/app.js — body link click handling, parameter fill logic
• core/.../generator/app.css — link styling
• demo/.../PetResource.java — add @link annotations
• Test YAML fixtures + browser tests

[t1]

Broken into sub-issues for incremental implementation:

1. Render OpenAPI Response Links in schema view #14 — Render OpenAPI Response Links in schema view
2. Schema link click navigates to target operation #15 — Schema link click navigates to target operation
3. Response body links: detect, navigate, and fill parameters #16 — Response body links: detect, navigate, and fill parameters

Each sub-issue is scoped to complete in a single agent session.

[t1]

All sub-issues completed: #14 (schema link rendering), #15 (click navigation), #16 (body links + param filling + demo app).