feat: use sqlite for jikan api cache with hourly cleanup

migrations/006_add_jikan_cache.sql

@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS jikan_cache (
+    key TEXT PRIMARY KEY,
+    data TEXT NOT NULL,
+    expires_at DATETIME NOT NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
+);