feat: review open answers in the admin and pick a grader per quiz

- Do oceny admin screen (golem15.quizzes.reviews) over the open answers,
  with a read-only context partial, score and comment virtual fields saved
  through SetScore, confirm and regrade record actions, bulk confirm
- open question type, rubric and max_length in the question form; grader
  dropdown on the quiz form from the grader registry
- Review model with quiz, status and student filters

controllers/reviews/_review_context.htm

@@ -0,0 +1,48 @@
+<div class="quizzes-review">
+{{with .Data}}
+    <dl>
+        <dt>{{trans "golem15.quizzes::lang.reviews.quiz"}}</dt>
+        <dd>{{.QuizTitle}}</dd>
+        <dt>{{trans "golem15.quizzes::lang.reviews.student"}}</dt>
+        <dd>{{if .StudentName}}{{.StudentName}} <span class="help-block">{{.StudentEmail}}</span>{{else}}{{.StudentEmail}}{{end}}</dd>
+        <dt>{{trans "golem15.quizzes::lang.reviews.question"}} ({{.QuestionPoints}} {{trans "golem15.quizzes::lang.reviews.points_short"}})</dt>
+        <dd><p class="whitespace-pre-wrap">{{.QuestionText}}</p></dd>
+{{if .ModelAnswer}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.model_answer"}}</dt>
+        <dd><p class="whitespace-pre-wrap">{{.ModelAnswer}}</p></dd>
+{{end}}
+{{if .Rubric}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.rubric"}}</dt>
+        <dd><p class="whitespace-pre-wrap">{{.Rubric}}</p></dd>
+{{end}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.text"}} <span class="help-block">{{trans "golem15.quizzes::lang.reviews.max_length"}}: {{.MaxLength}}</span></dt>
+        <dd><blockquote class="whitespace-pre-wrap">{{.Text}}</blockquote></dd>
+        <dt>{{trans "golem15.quizzes::lang.reviews.status"}}</dt>
+        <dd><strong>{{trans .StatusLabel}}</strong></dd>
+{{if .Grader}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.grader"}}</dt>
+        <dd>{{trans .GraderLabel}} <span class="help-block">{{trans "golem15.quizzes::lang.reviews.grading_attempts"}}: {{.GradingAttempts}}{{if .GradedAt}} · {{trans "golem15.quizzes::lang.reviews.graded_at"}}: {{.GradedAt}}{{end}}</span></dd>
+{{end}}
+{{if .HasGraderPoints}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.grader_points"}}</dt>
+        <dd>{{.GraderPoints}}</dd>
+{{end}}
+{{if .GraderFeedback}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.grader_feedback"}}</dt>
+        <dd><p class="whitespace-pre-wrap">{{.GraderFeedback}}</p></dd>
+{{end}}
+{{if .GradingError}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.grading_error"}}</dt>
+        <dd><p class="whitespace-pre-wrap">{{.GradingError}}</p></dd>
+{{end}}
+{{if .Reviewed}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.points"}}</dt>
+        <dd><strong>{{.Points}}</strong> / {{.QuestionPoints}}{{if .ReviewedAt}} <span class="help-block">{{trans "golem15.quizzes::lang.reviews.reviewed_at"}}: {{.ReviewedAt}}</span>{{end}}</dd>
+{{end}}
+{{if .ReviewComment}}
+        <dt>{{trans "golem15.quizzes::lang.reviews.review_comment"}}</dt>
+        <dd><p class="whitespace-pre-wrap">{{.ReviewComment}}</p></dd>
+{{end}}
+    </dl>
+{{end}}
+</div>

controllers/reviews/config_filter.yaml

@@ -0,0 +1,16 @@
+scopes:
+    quiz:
+        label: golem15.quizzes::lang.reviews.quiz
+        modelClass: Quiz
+        nameFrom: title
+        scope: filterByQuiz
+    status:
+        label: golem15.quizzes::lang.reviews.status
+        modelClass: Review
+        nameFrom: grading_status
+        scope: filterByStatus
+    student:
+        label: golem15.quizzes::lang.reviews.student
+        modelClass: Review
+        nameFrom: grading_status
+        scope: filterByStudent

controllers/reviews/config_form.yaml

@@ -0,0 +1,15 @@
+name: golem15.quizzes::lang.reviews.answer
+form: ~/plugins/golem15/quizzes/models/reviews/fields.yaml
+modelClass: Review
+defaultRedirect: golem15/quizzes/reviews
+
+# Open answers come from students: there is no create. Saving the form
+# stores the owner's score and comment, then returns to the preview.
+update:
+    redirect: golem15/quizzes/reviews/preview/:id
+    redirectClose: golem15/quizzes/reviews
+
+# The preview screen shows the answer and offers the record actions.
+preview: {}
+
+recordActions: [confirm, regrade]

controllers/reviews/config_list.yaml

@@ -0,0 +1,16 @@
+list: ~/plugins/golem15/quizzes/models/reviews/columns.yaml
+modelClass: Review
+title: golem15.quizzes::lang.reviews.title
+recordUrl: golem15/quizzes/reviews/preview/:id
+recordsPerPage: 50
+perPageOptions: [20, 50, 100]
+showCheckboxes: true
+defaultSort:
+    column: updated_at
+    direction: asc
+filter: config_filter.yaml
+bulkActions: [confirm]
+toolbar:
+    buttons: []
+    search:
+        prompt: backend::lang.list.search_prompt