feat(llama.cpp): add llama.cpp comprehensive recipes

Covers building, installing, running models with llama-server, and complete uninstallation of llama.cpp.

recipes/llama.cpp/03_uninstall-llama-cpp.md

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+# Uninstall llama.cpp
+
+This recipe completely removes llama.cpp from Ubuntu, including installed binaries, libraries, and the cloned source repository.
+
+## Stop Running Sessions
+
+```bash
+tmux kill-session -t llama
+```
+
+## Remove Installed Binaries
+
+```bash
+sudo rm -f /usr/local/bin/llama*
+```
+
+## Remove Installed Libraries
+
+```bash
+sudo rm -f /usr/local/lib/libllama*
+sudo rm -f /usr/local/lib/libggml*
+sudo rm -rf /usr/local/include/llama.h /usr/local/include/ggml*
+sudo ldconfig
+```
+
+## Remove Cloned Repository
+
+Replace `<PATH>` with the path where the repository was cloned (e.g. `~/llama.cpp`).
+
+```bash
+rm -rf <PATH>
+```
+
+## Remove Build Dependencies (Optional)
+
+Only run this if the packages are not needed by other projects.
+
+```bash
+sudo apt purge -y build-essential cmake libcurl4-openssl-dev
+sudo apt autoremove -y
+```
+
+## Verify Removal
+
+Check that the binary is no longer available.
+
+```bash
+which llama
+```
+
+Expected output:
+
+```text
+(no output)
+```