Fix Firecrawl install: add ccache dependency for koffi native build

[michelroegl-brunner]

✍️ Description

The Firecrawl install fails during pnpm install --frozen-lockfile while building the native koffi@2.9.0 module. On the Debian 13 (Proxmox 9.1) template, koffi has no prebuilt binary for Node 22 / linux_x64, so it builds from source. Its build script (cnoke/builder.js) auto-detects ccache and passes -DCMAKE_C_COMPILER_LAUNCHER=ccache to CMake, but a usable ccache binary isn't present when gmake runs, so every compile fails with error 127 (ccache: No such file or directory) and CMake reports the C compiler as broken.

The compiler (gcc-14/cc) itself is fine — the Go cgo library and Rust both build successfully earlier in the script. Only the ccache launcher breaks the build. Fix: add ccache to the apt dependency list so koffi's auto-detected compiler launcher works.

Authored with AI assistance: Claude Opus 4.8 (Claude Code), high reasoning level.

🔗 Related Issue

Fixes #16744

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