fix(ci): gate cache & storage crate doctests behind their features

Same E0432 class as mytheclipse-event: the crate-root doctests referenced
feature-gated types that are absent in reduced-feature test builds flagged by
the CI matrix.

- mytheclipse-cache: example used MemoryCache (l1-memory) plus
  MultiLayerCache/CacheAside (cache-aside); the l1-moka and l2-redis builds
  (which don't enable cache-aside) failed the doctest. Gated the body behind
  all(l1-memory, cache-aside) with a no-op fallback.
- mytheclipse-storage: example used LocalFileStorage (local feature); the
  gcs and s3 builds failed the doctest. Gated the body behind the local
  feature with a no-op fallback.

Examples remain compile-checked & runnable under default features.

crates/mytheclipse-storage/src/lib.rs

@@ -15,15 +15,22 @@
 //!
 //! ## Example
 //!
-//! ```
-//! use mytheclipse_storage::{LocalFileStorage, StorageDriver, bytes_stream, read_to_vec};
-//! # #[tokio::main] async fn main() {
+//! Local disk storage (`local` feature, default):
+//!
+//! ```no_run
+//! use mytheclipse_storage::{StorageDriver, bytes_stream, read_to_vec};
+//! # #[cfg(feature = "local")]
+//! # #[tokio::main]
+//! # async fn main() {
+//! use mytheclipse_storage::LocalFileStorage;
 //! # let dir = tempfile::tempdir().unwrap();
 //! let storage = LocalFileStorage::new(dir.path());
 //! storage.put("hello.txt", bytes_stream(b"hi".to_vec())).await.unwrap();
 //! let data = read_to_vec(storage.get("hello.txt").await.unwrap()).await.unwrap();
 //! assert_eq!(data, b"hi");
 //! # }
+//! # #[cfg(not(feature = "local"))]
+//! # fn main() {}
 //! ```
 
 pub mod traits;