fix(runtime): refresh runtime packaging dependencies

[slomin]

Summary

• refresh runtime packaging so nested upstream shared libraries are bundled for current ik_llama builds
• include requirements files in the remote Pi build checkout so install_dev.sh can run from /tmp/potato-os
• install libvulkan1 as a LiteRT native runtime dependency required by litert-lm-api 0.12.0

Closes #315

Runtime releases

• ik_llama 40aae0b, pi5-opt: https://github.com/potato-os/core/releases/tag/runtime/ik_llama-40aae0b
• llama_cpp 45b455e, universal: https://github.com/potato-os/core/releases/tag/runtime/llama_cpp-45b455e

Test evidence

• uv run python -m pytest tests/unit tests/api -q -n auto: 582 passed
• npx playwright test tests/ui/runtime.spec.js tests/ui/settings.spec.js --reporter=dot --timeout=15000: 35 passed
• bin/publish_runtime.sh --family ik_llama --dry-run: produced ik_llama-40aae0b-pi5-opt.tar.gz
• bin/publish_runtime.sh --family llama_cpp --dry-run: produced llama_cpp-45b455e-universal.tar.gz

Pi QA

• Device: potato.local, Raspberry Pi 5 Model B Rev 1.0, aarch64
• Built latest ik_llama from https://github.com/ikawrakow/ik_llama.cpp commit 40aae0b
• Built latest llama.cpp from https://github.com/ggerganov/llama.cpp commit 45b455e
• Installed refreshed ik_llama slot; /status READY on family ik_llama commit 40aae0b
• Chat smoke on ik_llama returned: Potato Runtime OK.
• Installed refreshed llama_cpp slot; /status READY on family llama_cpp commit 45b455e
• Chat smoke on llama_cpp returned: Llama C++ Runtime is available now.
• Runtime switch API llama_cpp -> ik_llama succeeded and returned READY
• Installed litert-lm-api 0.12.0 and libvulkan1; LiteRT /health returned {"status":"ok","vision":true}
• Downloaded and activated gemma-4-E2B-it.litertlm; LiteRT chat smoke returned: LiteRT runtime ok.

Notes

• Current ik_llama upstream places required shared libraries such as libmtmd.so outside top-level build lib/bin directories, so runtime packaging now recursively collects required runtime .so files.
• LiteRT-LM 0.12.0 requires libvulkan.so.1 to load its native library even for CPU engine startup.