feat: add repair timeline read APIs

backend/app/repairs/service.py

@@ -8,11 +8,16 @@ from app.repairs.exceptions import (
     InconsistentRepairState,
     RepairActorRequired,
     RepairMinerNotFound,
+    RepairNotFound,
 )
 from app.repairs.models import (
     BeginRepairRequest,
     BeginRepairResult,
     InitialRepairNotePayload,
+    RepairActor,
+    RepairDetail,
+    RepairTimeline,
+    RepairTimelineEvent,
     RepairStartedPayload,
 )
 from app.repairs.repository import RepairRepository
@@ -101,3 +106,55 @@ class RepairService:
             opened_at=repair["opened_at"],
             opened_by=repair["opened_by"],
         )
+
+    def get_repair(self, repair_id: UUID) -> RepairDetail:
+        repair = self.repository.get_repair_detail(repair_id)
+        if repair is None:
+            raise RepairNotFound(repair_id)
+
+        closed_by = None
+        if repair["closed_by_user_id"] is not None:
+            closed_by = RepairActor(
+                user_id=repair["closed_by_user_id"],
+                display_name=repair["closed_by_display_name"],
+            )
+
+        return RepairDetail(
+            repair_id=repair["repair_id"],
+            miner_id=repair["miner_id"],
+            miner_asset_id=repair["miner_asset_id"],
+            status=repair["status"],
+            reason=repair["reason"],
+            opened_at=repair["opened_at"],
+            opened_by=RepairActor(
+                user_id=repair["opened_by_user_id"],
+                display_name=repair["opened_by_display_name"],
+            ),
+            closed_at=repair["closed_at"],
+            closed_by=closed_by,
+            miner_lifecycle=repair["miner_lifecycle"],
+            latest_event_sequence=repair["latest_event_sequence"],
+        )
+
+    def get_repair_timeline(self, repair_id: UUID) -> RepairTimeline:
+        events = self.repository.get_repair_events(repair_id)
+        if events is None:
+            raise RepairNotFound(repair_id)
+
+        return RepairTimeline(
+            repair_id=repair_id,
+            events=[
+                RepairTimelineEvent(
+                    event_id=event["event_id"],
+                    sequence=event["sequence"],
+                    event_type=event["event_type"],
+                    actor=RepairActor(
+                        user_id=event["actor_user_id"],
+                        display_name=event["actor_display_name"],
+                    ),
+                    occurred_at=event["occurred_at"],
+                    payload=event["payload"],
+                )
+                for event in events
+            ],
+        )