feat(poster-storage): implement S3/Minio storage adapter and configuration

Co-authored-by: Copilot <copilot@github.com>

Cargo.toml

@@ -1,7 +1,7 @@
 [workspace]
 members = [
     "crates/adapters/auth",
-    "crates/adapters/metadata",
+    "crates/adapters/metadata", "crates/adapters/poster-storage",
     "crates/adapters/rss",
     "crates/adapters/sqlite",
     "crates/adapters/template-askama",
@@ -31,6 +31,7 @@ sqlx = { version = "0.8.6", features = [
     "macros",
 ] }
 reqwest = { version = "0.13", features = ["json", "query"] }
+object_store = { version = "0.11", features = ["aws"] }
 
 domain = { path = "crates/domain" }
 common = { path = "crates/common" }
@@ -38,6 +39,7 @@ application = { path = "crates/application" }
 presentation = { path = "crates/presentation" }
 auth = { path = "crates/adapters/auth" }
 metadata = { path = "crates/adapters/metadata" }
+poster-storage = { path = "crates/adapters/poster-storage" }
 rss = { path = "crates/adapters/rss" }
 sqlite = { path = "crates/adapters/sqlite" }
 template-askama = { path = "crates/adapters/template-askama" }