refactor(cache): redesign cache system with structured keys and improved performance

- Add repo_path parameter to cached_response and cached_vec_response functions
- Implement structured cache key format with namespace, repo_path, and request proto
- Replace global cache with Moka in-memory cache using weight-based eviction
- Set 256MB memory cap with 10-minute TTL and 2-minute TTI policy
- Add metrics collection for cache operations and evictions
- Implement efficient repo-scoped invalidation using key structure
- Add detailed documentation comments explaining cache architecture
- Remove outdated dependencies and update dependency versions
- Add error handling for encoding failures in cache operations
- Optimize Vec responses with length-delimited encoding and pre-allocation

server/archive.rs

@@ -77,7 +77,7 @@ impl archive_service_server::ArchiveService for GitksService {
             }
         };
         let resp = if cache::selector_is_oid(&inner.treeish) {
-            cache::cached_response("archive.list_archive_entries", &inner, || {
+            cache::cached_response("archive.list_archive_entries", &repo, &inner, || {
                 gb.list_archive_entries(inner.clone()).map_err(into_status)
             })?
         } else {