init: init proj

DDYSClient/Services/ContentCache.swift

@@ -0,0 +1,24 @@
+import Foundation
+
+@Observable
+final class ContentCache {
+    static let shared = ContentCache()
+
+    private var timestamps: [String: Date] = [:]
+    private let ttl: TimeInterval = 300 // 5 分钟
+
+    private init() {}
+
+    func isExpired(key: String) -> Bool {
+        guard let ts = timestamps[key] else { return true }
+        return Date().timeIntervalSince(ts) > ttl
+    }
+
+    func markFresh(key: String) {
+        timestamps[key] = Date()
+    }
+
+    func invalidate(key: String) {
+        timestamps[key] = nil
+    }
+}