fix: remove hardcoded /workspace/bin/cc from cargo config — use system defaults

The hardcoded paths broke CI (GitHub Actions) and local builds outside the
original container environment. CC/AR should be set via env vars when needed.

Author: Kadajett

.cargo/config.toml

@@ -1,7 +1,3 @@
-[target.aarch64-unknown-linux-gnu]
-linker = "/workspace/bin/cc"
-ar = "/workspace/bin/ar"
-
-[env]
-CC = "/workspace/bin/cc"
-AR = "/workspace/bin/ar"
+# Cross-compilation config
+# CC/AR are not hardcoded — use system defaults or set via environment variables:
+#   CC=/path/to/cc AR=/path/to/ar cargo build --target aarch64-unknown-linux-gnu