feat: Instanceの取得に失敗したら仮の情報で保存するように

src/main/kotlin/dev/usbharu/hideout/core/service/instance/InstanceService.kt

@@ -37,7 +37,7 @@ interface InstanceService {
 class InstanceServiceImpl(
     private val instanceRepository: InstanceRepository,
     private val resourceResolveService: ResourceResolveService,
-    @Qualifier("activitypub") private val objectMapper: ObjectMapper
+    @Qualifier("activitypub") private val objectMapper: ObjectMapper,
 ) : InstanceService {
     override suspend fun fetchInstance(url: String, sharedInbox: String?): Instance {
         val u = URL(url)
@@ -51,6 +51,9 @@ class InstanceServiceImpl(
 
         logger.info("Instance not found. try fetch instance info. url: {}", resolveInstanceUrl)
 
+        try {
+
+
             val nodeinfoJson = resourceResolveService.resolve("$resolveInstanceUrl/.well-known/nodeinfo").bodyAsText()
             val nodeinfo = objectMapper.readValue(nodeinfoJson, Nodeinfo::class.java)
             val nodeinfoPathMap = nodeinfo.links.associate { it.rel to it.href }
@@ -100,7 +103,21 @@ class InstanceServiceImpl(
                 }
             }
 
-        throw IllegalStateException("Nodeinfo aren't found.")
+
+        } catch (e: Exception) {
+            logger.warn("FAILED Fetch Instance", e)
+        }
+        return createNewInstance(
+            InstanceCreateDto(
+                name = null,
+                description = null,
+                url = resolveInstanceUrl,
+                iconUrl = "$resolveInstanceUrl/favicon.ico",
+                sharedInbox = null,
+                software = null,
+                version = null
+            )
+        )
     }
 
     override suspend fun createNewInstance(instanceCreateDto: InstanceCreateDto): Instance {