feat(question): MCQ options authoring editor (Phase 2 domain foundation)

Backend now supports MCQ options + a separate answer-key table
(PUT /questions/:id/options). Frontend side of that, authoring only —
no candidate exam-taking UI.

- Question type gains options?: QuestionOption[] (no correctness field —
  the API never returns one, matching the backend's split-table design)
- New question-api hooks: getQuestionWithOptions, setQuestionOptions
- New QuestionOptionsEditor component (separate file, not inlined into
  QuestionPage) — add/remove/reorder options, mark correct, bilingual text
- Wired into the question edit form, shown only for an existing CHOICE
  question (options attach to an id, matching the backend's replace
  endpoint)
- en/am i18n strings for the new editor

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/backoffice/src/app/i18n/locales/am.ts

@@ -738,6 +738,20 @@ export const am: Translations = {
       onlyApprovedUsable: "የጸደቁ ጥያቄዎች ብቻ በፈተና ወረቀት ላይ ሊቀመጡ ይችላሉ።",
       error: "ተግባሩ አልተሳካም",
     },
+    options: {
+      title: "የመልስ አማራጮች",
+      hint: "ትክክለኛውን አማራጭ ምረጥ/ምረጪ። ማስቀመጥ መላውን የአማራጭ ስብስብ ይተካል።",
+      optionLabel: "አማራጭ {{number}}",
+      correct: "ትክክለኛ",
+      addOption: "አማራጭ ጨምር",
+      save: "አማራጮችን አስቀምጥ",
+      saved: "አማራጮች ተቀምጠዋል",
+      saveFirst: "መጀመሪያ ጥያቄውን አስቀምጥ፣ ከዚያ አማራጮችን ጨምር።",
+      replaceNotice: "ትክክለኛ መልሶች ከተቀመጡ በኋላ እዚህ አይታዩም — እንደገና ካስተካከልክ/ካስተካከልሽ ዳግም ምረጥ/ምረጪ።",
+      needAtLeastTwo: "ጥያቄ ቢያንስ ሁለት አማራጮች ያስፈልገዋል።",
+      needOneCorrect: "ቢያንስ አንድ አማራጭ እንደ ትክክለኛ ምረጥ/ምረጪ።",
+      textRequired: "እያንዳንዱ አማራጭ በሁለቱም ቋንቋዎች ጽሑፍ ያስፈልገዋል።",
+    },
   },
 
   configuration: {

apps/backoffice/src/app/i18n/locales/en.ts

@@ -739,6 +739,21 @@ export const en = {
         'Only approved items can be placed on an examination paper.',
       error: 'Operation failed',
     },
+    options: {
+      title: 'Answer Options',
+      hint: 'Mark every correct option. Saving replaces the entire option set.',
+      optionLabel: 'Option {{number}}',
+      correct: 'Correct',
+      addOption: 'Add option',
+      save: 'Save options',
+      saved: 'Options saved',
+      saveFirst: 'Save the question first, then add its options.',
+      replaceNotice:
+        'Correct answers are never shown here once saved — re-mark them if you edit this set again.',
+      needAtLeastTwo: 'A question needs at least two options.',
+      needOneCorrect: 'Mark at least one option as correct.',
+      textRequired: 'Every option needs text in both languages.',
+    },
   },
 
   configuration: {