Move chunk server RequestQueue initialization to connection time

The RequestQueue for chunk servers should be initialized when the
connection is actually established in get_chunk_server_connection(),
not ahead of time during tinydfs_init().

The metadata server RequestQueue initialization remains in tinydfs_init()
since the metadata server connection is established during initialization.

Changes:
- Removed premature RequestQueue initialization for chunk servers
- Added clarifying comments about initialization timing
- RequestQueue is initialized in get_chunk_server_connection() (line 227)

src/client.c

@@ -121,16 +121,16 @@ TinyDFS *tinydfs_init(char *addr, uint16_t port)
     for (int i = 0; i < MAX_OPERATIONS; i++)
         tdfs->operations[i].type = OPERATION_TYPE_FREE;
 
-    // Initialize metadata server
+    // Initialize metadata server (connected during init)
     tdfs->metadata_server.used = true;
     tdfs->metadata_server.addr = addr2;
     request_queue_init(&tdfs->metadata_server.reqs);
 
-    // Initialize chunk servers
+    // Initialize chunk servers array (connections created on demand)
     tdfs->num_chunk_servers = 0;
     for (int i = 0; i < MAX_CHUNK_SERVERS; i++) {
         tdfs->chunk_servers[i].used = false;
-        request_queue_init(&tdfs->chunk_servers[i].reqs);
+        // Note: RequestQueue initialized in get_chunk_server_connection()
     }
 
     return tdfs;