Support rendering OpenAPI spec

[wxiaoguang]

Fix #20852

[wxiaoguang]

[Copilot]

Pull request overview

This PR refactors the markup rendering system to use file name patterns instead of simple extensions, and adds support for rendering OpenAPI/Swagger specification files using swagger-ui.

Changes:

• Refactored renderer interface to use FileNamePatterns() instead of Extensions() for more flexible file matching (supports patterns like *.yaml and exact names like openapi.yaml)
• Added OpenAPI renderer that embeds swagger-ui to display OpenAPI/Swagger specs in YAML or JSON format
• Updated all renderer implementations and detection logic to use the new pattern-based approach

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
modules/markup/external/openapi.go	New OpenAPI renderer implementation with swagger-ui integration
modules/markup/renderer.go	Refactored renderer detection to support file name patterns
modules/markup/render.go	Updated render context detection methods
web_src/js/standalone/swagger.ts	Enhanced to support inline spec content and YAML parsing
web_src/css/standalone/swagger.css	Hides embedded spec content textarea
modules/setting/markup.go	Updated configuration to use file patterns instead of extensions
modules/markup/*/[renderers]	Updated all built-in renderers to use FileNamePatterns()
routers/web/repo/*.go	Updated file view routes to use new detection methods
package.json	Added js-yaml dependency for YAML parsing
tests/integration/markup_external_test.go	Updated tests for renamed functions

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[silverwind]

I tried swapping the yaml module to https://github.com/eemeli/yaml, but it resulted in a 300kB larger bundle size, so js-yaml is still superior. Maybe once the yaml module releases v3, it will become superior.

[silverwind]

Tested it, works well.