chore: lake-frontend via git ref (drop ../lake-frontend path)

Switch to `git = "https://github.com/morphqdd/lake_frontend.git",
branch = "dev"` so CI runners + fresh clones can resolve the
dependency without a sibling checkout.

Verified: cargo fetched lake-frontend@dev (commit 6143667), built
clean, 40 / 40 integration tests pass.

Author: morphqdd

Cargo.lock

@@ -15,7 +15,7 @@ base64ct = {version = "1.8.2", features = ['alloc']}
 cranelift = { version = "0.127.0", features = ["module", "native", "object"] }
 cranelift-wasm = "0.112.3"
 chumsky = { git = "https://github.com/zesterer/chumsky.git", features = ["pratt"] }
-lake-frontend = { path = "../lake-frontend" }
+lake-frontend = { git = "https://github.com/morphqdd/lake_frontend.git", branch = "dev" }
 num_cpus = "1.17.0"
 
 [dev-dependencies]