Every CI action is a CRUD action, and the URLs do not move

`CiController` had three actions named after verbs — `pipelines`, `status`,
`trigger` — and built its JSON by hand in a private `pipeline_json`, in a
codebase where everything else is serialized by Blueprinter. Triggering a
build is the creation of a run, so it is a resource of its own:

    GET  /api/ci/pipelines             -> Api::Ci::PipelinesController#index
    GET  /api/ci/pipelines/:id/status  -> Api::Ci::PipelinesController#show
    POST /api/ci/pipelines/:id/trigger -> Api::Ci::PipelineRunsController#create

The addresses are untouched on purpose: they are what the CI and the scripts
already call, and renaming them would be a breaking change for a version that
does not need one. What changed is the shape behind them — three standard
actions across two controllers, `require_ci!` and the pipeline scope in a
shared base, and a `PipelineSerializer` that carries the fields the endpoint
already answered with, `repo_id` and `woodpecker_repo_id` included (the
duplicate stays: a client may read either, and ci_controller_spec asserts they
agree).

`/api/software/highlighted` answers with `#show` now rather than `#index`: it
returns one title, and the action name should say so. Same address, same body.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

config/routes.rb

@@ -9,14 +9,14 @@ WarpEngine::Engine.routes.draw do
     end
 
     get "software",               to: "software#index"
-    get "software/highlighted",   to: "software_highlighted#index"
+    get "software/highlighted",   to: "software_highlighted#show"
     get "download",               to: "downloads#show"
     get "builds",                 to: "builds#index"
     get "softwares/:name/builds", to: "software_builds#show"
 
-    get  "ci/pipelines",             to: "ci#pipelines"
-    get  "ci/pipelines/:id/status",  to: "ci#status"
-    post "ci/pipelines/:id/trigger", to: "ci#trigger"
+    get  "ci/pipelines",             to: "ci/pipelines#index"
+    get  "ci/pipelines/:id/status",  to: "ci/pipelines#show"
+    post "ci/pipelines/:id/trigger", to: "ci/pipeline_runs#create"
   end
 
   post "build/upload",  to: "build/uploads#create"