CodeBench: reqwest 0.13 + Docker volume cache + rust:latest

- reqwest 0.12 → 0.13, rustls-tls → rustls (golden, Dockerfile, promptit)
- Docker volume cache: kipina-cargo-registry + kipina-cargo-target
- rust:latest (1.94) + cmake (aws-lc-sys vaatii)
- Dockerfile yksinkertaistettu — esikäännös ei toimi, volume hoitaa
- Golden example 10/10 testattu uudella setupilla

kipina-codebench/Dockerfile.cargo-test

@@ -1,28 +1,4 @@
-FROM rust:1.87-slim
-RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/*
+FROM rust:latest
+RUN apt-get update && apt-get install -y pkg-config libssl-dev cmake && rm -rf /var/lib/apt/lists/*
 WORKDIR /work
-
-# Esikäännä riippuvuudet dummy-projektilla — nämä cachetaan Docker-layeriin
-RUN cargo init --name bench-precompile . && \
-    cat > Cargo.toml <<'TOML'
-[package]
-name = "bench-precompile"
-version = "0.1.0"
-edition = "2024"
-
-[dependencies]
-axum = "0.8"
-tokio = { version = "1", features = ["full"] }
-serde = { version = "1", features = ["derive"] }
-serde_json = "1"
-sqlx = { version = "0.8", features = ["sqlite", "runtime-tokio"] }
-tower-http = { version = "0.6", features = ["cors"] }
-chrono = { version = "0.4", features = ["serde"] }
-
-[dev-dependencies]
-reqwest = { version = "0.12", default-features = false, features = ["json", "rustls-tls"] }
-tokio = { version = "1", features = ["full", "test-util"] }
-TOML
-RUN cargo check 2>&1 && cargo build --tests 2>&1 && rm -rf src target/debug/deps/bench_precompile* target/debug/bench-precompile*
-
 ENTRYPOINT ["sh", "-c", "cp -r /src/* . && cargo test 2>&1"]