feat(api): complete phase 9 mobile contracts

server/instance/service.ts

@@ -0,0 +1,54 @@
+import { randomUUID } from "node:crypto";
+import type { DomainDatabase } from "../domain/database";
+import { DomainError } from "../domain/errors";
+import { createInstanceRepository } from "../repositories/instance";
+
+export type InstanceIdentity = {
+  instanceId: string;
+  createdAt: string;
+};
+
+export class InstanceService {
+  private readonly repository;
+
+  constructor(private readonly db: DomainDatabase) {
+    this.repository = createInstanceRepository(db);
+  }
+
+  getIdentity(): InstanceIdentity {
+    const existing = this.repository.get();
+    if (existing) return toIdentity(existing);
+
+    this.repository.createIfMissing(randomUUID());
+    const created = this.repository.get();
+    if (!created) {
+      throw new DomainError(
+        "INVARIANT_VIOLATION",
+        "Instance kimliği oluşturulamadı.",
+      );
+    }
+    return toIdentity(created);
+  }
+}
+
+function toIdentity(value: {
+  instanceId: string;
+  createdAt: string;
+}): InstanceIdentity {
+  return {
+    instanceId: value.instanceId,
+    createdAt: sqliteTimestampToIso(value.createdAt),
+  };
+}
+
+function sqliteTimestampToIso(value: string): string {
+  const normalized = value.includes("T") ? value : `${value.replace(" ", "T")}Z`;
+  const timestamp = new Date(normalized);
+  if (Number.isNaN(timestamp.getTime())) {
+    throw new DomainError(
+      "INVARIANT_VIOLATION",
+      "Instance oluşturulma zamanı geçersiz.",
+    );
+  }
+  return timestamp.toISOString();
+}