integrations(jellyfin): add event ingestion and sync scaffolding + migration

src/main/kotlin/com/project/movienight/adapters/web/JellyfinSyncController.kt

@@ -0,0 +1,21 @@
+package com.project.movienight.adapters.web
+
+import com.project.movienight.application.services.JellyfinSyncService
+import com.project.movienight.domain.model.JellyfinSyncState
+import com.project.movienight.domain.model.JellyfinSyncSummary
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@RequestMapping("/api/integrations/jellyfin")
+class JellyfinSyncController(
+    private val jellyfinSyncService: JellyfinSyncService,
+) {
+    @PostMapping("/sync")
+    fun syncNow(): JellyfinSyncSummary = jellyfinSyncService.syncNow()
+
+    @GetMapping("/sync-state")
+    fun syncState(): List<JellyfinSyncState> = jellyfinSyncService.getSyncStates()
+}