refactor: split ai/ into hermes/ and ollama/ directories

- Rename ai/ to hermes/ (Hermes agent service)
- Move ai/ollama/ to ollama/ (top-level, Ollama ROCm/gfx906 service)
- Add ollama/compose.yml for standalone ollama deployment
- Update hermes/compose.yml: remove ollama service (now in ollama/)
- Update Makefile SERVICES list: ai -> hermes, add ollama
- Bump ollama version from v0.13.5 to v0.23.2

ollama/Dockerfile

@@ -0,0 +1,61 @@
+# ollama/Dockerfile
+#
+# Custom ollama image with ROCm + gfx906 (MI50) support.
+# The default ollama/rocm image ships ROCm 7.2 which drops gfx906 support.
+# This builds ollama and its llama.cpp runner from source, targeting gfx906.
+#
+# Build:
+#   docker build -t ollama/ollama:rocm-gfx906 ./ollama
+
+FROM rocm/dev-ubuntu-22.04:6.1.2-complete AS builder
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    git golang-go cmake build-essential pkg-config \
+    && rm -rf /var/lib/apt/lists/*
+
+ARG OLLAMA_VERSION=v0.23.2
+RUN git clone --depth 1 --branch ${OLLAMA_VERSION} https://github.com/ollama/ollama.git /build
+WORKDIR /build
+
+ENV HIP_PATH=/opt/rocm
+ENV ROCM_PATH=/opt/rocm
+ENV PATH=/opt/rocm/bin:/opt/rocm/hip/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+RUN cd llama.cpp && \
+    mkdir -p build && cd build && \
+    cmake .. \
+      -DLLAMA_HIPBLAS=ON \
+      -DCMAKE_C_COMPILER=clang \
+      -DCMAKE_CXX_COMPILER=clang++ \
+      -DAMDGPU_TARGETS=gfx906 \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DLLAMA_NATIVE=OFF \
+      -DLLAMA_BUILD_TESTS=OFF \
+      -DLLAMA_BUILD_EXAMPLES=OFF \
+      -DLLAMA_BUILD_SERVER=OFF && \
+    cmake --build . --config Release -j$(nproc) && \
+    cmake --install . --prefix /build/dist
+
+ENV CGO_ENABLED=0
+RUN go build -trimpath -o dist/ollama .
+
+FROM ubuntu:22.04
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    ca-certificates curl libstdc++6 libgomp1 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /opt/rocm/lib/ /opt/rocm/lib/
+COPY --from=builder /opt/rocm/share/ /opt/rocm/share/
+COPY --from=builder /build/dist/ollama /usr/bin/ollama
+COPY --from=builder /build/dist/lib/ /usr/lib/ollama/
+
+RUN ldconfig
+
+ENV LD_LIBRARY_PATH=/opt/rocm/lib:/usr/lib/ollama
+ENV HSA_OVERRIDE_GFX_VERSION=9.0.6
+ENV HCC_AMDGPU_TARGET=gfx906
+ENV HSA_ENABLE_SDMA=0
+
+EXPOSE 11434
+ENTRYPOINT ["/bin/ollama"]
+CMD ["serve"]