Given a Map<String, Object> representing a file system structure, calculate the total size of the directory including all subdirectories recursively. Map values are either Integers representing file sizes or nested Maps representing subdirectories.
This pattern mirrors roll-up summaries in hierarchical Salesforce data structures like Account hierarchies or custom object relationships.
Examples:
Input: directory = {'file1.txt' => 100, 'file2.txt' => 200}
Output: 300
Explanation: Two files with sizes 100 and 200 sum to 300
Input: directory = {'file1.txt' => 100, 'subfolder' => {'file2.txt' => 200, 'file3.txt' => 50}}
Output: 350
Explanation: file1.txt (100) plus subfolder contents (200 + 50) equals 350
Input: directory = {}
Output: 0
Explanation: Empty directory has size 0
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