chore(justfile): move backend-related justfile to backend dir

justfile

@@ -1,51 +1,5 @@
-default: run
-
-run:
-	cargo run
-
-run-release:
-	cargo run --release
-
-format:
-	cargo fmt --all
-
-format-check:
-	cargo fmt --check --all
-
-audit:
-	cargo deny check
-
-build:
-	cargo build
-
-build-release:
-	cargo build --release
-
-lint:
-	cargo clippy --all-targets
-
-release-build:
-	cargo build --release
-
-release-run:
-	cargo run --release
-
-[env("SQLX_OFFLINE", "1")]
-test:
-	cargo test --all --all-targets
-
-test-hardware:
-	cargo test --all --all-targets -- --ignored
-
-coverage:
-	mkdir -p coverage
-	cargo tarpaulin --config backend/.tarpaulin.local.toml
-
-coverage-ci:
-	mkdir -p coverage
-	cargo tarpaulin --config backend/.tarpaulin.ci.toml
-
-check-all: format-check lint coverage audit
+mod backend
+mod frontend
 
 ## Local Variables:
 ## mode: makefile