Task #710: Weekly availability intervals (Calendly-style) for protocol booking slots

- DB: protocol_booking_slots.days_of_week integer[] NOT NULL default {0..6} (0=Sun..6=Sat, Riyadh); pushed via drizzle-kit, legacy rows keep all-days behaviour.
- API (routes/protocol.ts): slot create/patch accept daysOfWeek (validated, deduped, sorted); new POST /protocol/booking-slots/generate (requireManageRooms) generates stepped slots in [from,to) skipping existing start times (onConflictDoNothing), returns {created,skipped,slots}, 400 interval_too_short; matchesActiveSlot and public availability now filter by Riyadh weekday.
- UI (protocol.tsx): interval-generation form (from/to/duration + day toggle pills + workdays/all-days presets), slot list shows day names, booking dialog filters slots by chosen date weekday with stale-selection reset and empty-day hint. i18n keys added (ar/en).
- Tests: 13/13 pass incl. generation, duplicate skipping, validation, weekday filtering in availability + booking rejection, viewer 403 on generate.
- Architect review: Pass; added the suggested authz test.

artifacts/tx-os/src/locales/ar.json

@@ -1911,7 +1911,29 @@
       "leadSaved": "تم حفظ المهلة",
       "dateLabel": "التاريخ",
       "slotLabel": "الوقت",
-      "pickSlot": "اختر الوقت"
+      "pickSlot": "اختر الوقت",
+      "days": "الأيام",
+      "allDays": "كل الأيام",
+      "weekdaysPreset": "أيام العمل",
+      "allDaysPreset": "كل الأيام",
+      "dayNames": {
+        "0": "الأحد",
+        "1": "الاثنين",
+        "2": "الثلاثاء",
+        "3": "الأربعاء",
+        "4": "الخميس",
+        "5": "الجمعة",
+        "6": "السبت"
+      },
+      "intervalTitle": "إضافة فترة توفر",
+      "intervalHint": "حدد فترة (من – إلى) والأيام ومدة الوقت، وستتولّد الأوقات تلقائيًا ضمن الفترة. الأوقات المكررة تُتجاهل.",
+      "intervalFrom": "من",
+      "intervalTo": "إلى",
+      "generate": "توليد الأوقات",
+      "generated": "تم توليد {{created}} وقتًا (تم تجاهل {{skipped}} مكررًا)",
+      "generatedNone": "لم يتولد أي وقت — كل الأوقات موجودة مسبقًا.",
+      "pickDay": "اختر يومًا واحدًا على الأقل",
+      "noSlotsForDay": "لا توجد أوقات متاحة في هذا اليوم"
     }
   }
 }