fix(exam): cap cutting point input at 100 for Percentage evaluation

Matches the new backend rule. Field caps at 100 and shows a hint the
moment Percentage is selected, instead of letting you type 150 and only
finding out later.

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

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

@@ -259,6 +259,8 @@ export const am: Translations = {
       random: "በዘፈቀደ",
       cuttingPoint: "የማለፊያ ነጥብ",
       cuttingPointPlaceholder: "ለማለፍ ዝቅተኛ ነጥብ",
+      cuttingPointPercentagePlaceholder: "ለማለፍ ዝቅተኛ መቶኛ (0-100)",
+      cuttingPointPercentageHint: "የመቶኛ ግምገማ — ከ100 አይበልጥም።",
       fillRequiredBasic: "በመሠረታዊ መረጃ ውስጥ ያሉ አስፈላጊ መስኮችን ይሙሉ።",
       fillRequiredSettings: "በቅንብሮች ውስጥ ያሉ አስፈላጊ መስኮችን ይሙሉ — ዓይነት፣ ቅጽ፣ የአስተዳደር ዘዴ፣ የግምገማ ዘዴ እና የማለፊያ ነጥብ።",
       directionBothLanguages: "መመሪያ በሁለቱም እንግሊዝኛ እና አማርኛ ጽሑፍ ያስፈልገዋል፣ ወይም ሁለቱንም ባዶ ይተዉ።",

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

@@ -257,6 +257,8 @@ export const en = {
       random: 'Random',
       cuttingPoint: 'Cutting Point (Pass Mark)',
       cuttingPointPlaceholder: 'Minimum score to pass',
+      cuttingPointPercentagePlaceholder: 'Minimum % to pass (0-100)',
+      cuttingPointPercentageHint: 'Percentage evaluation — capped at 100.',
       fillRequiredBasic: 'Please fill all required fields in Basic Info.',
       fillRequiredSettings: 'Please fill all required fields in Settings — type, form, administration method, evaluation method, and cutting point.',
       directionBothLanguages: 'Direction needs text in both English and Amharic, or leave both empty.',