⚡ Bolt: [performance improvement] Avoid clone via surface_count and iter_surfaces

[Lucenx9]

💡 What: Added iter_surfaces and surface_count methods to WorkspaceModel to avoid allocating Vec<Surface> when counting or iterating over surfaces. Replaced .list_surfaces(...).len() and .list_surfaces(...).iter() with these new methods.
🎯 Why: The list_surfaces method clones all matched surfaces into a new Vector. In many call sites, we only need the count, or we only want to iterate over the items without mutating them, making the Vector allocation and struct cloning completely redundant.
📊 Impact: Reduces heap allocations directly correlated to the number of surfaces present in the workspace, particularly improving performance during updates affecting surface trees.
🔬 Measurement: Review memory profiling during surface operations or monitor the number of Vec allocations during heavy workspace load.

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PR created automatically by Jules for task 15563467038579687858 started by @Lucenx9

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