feat: add sccache caching for Rust builds in release workflow #26

Job	Run time
Tauri build smoke test	4m 42s
Rust check & test	1m 27s
Frontend lint, typecheck & unit tests	36s
Offline critical journey tests	1m 16s
1.x → 2.0 migration rehearsal	1m 38s
	9m 39s

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