Reorganize Docker build infrastructure for better maintainability

- Restructure from ollama37/ to docker/ with clear separation
- Separate builder and runtime images into dedicated directories
- Group environment scripts in builder/scripts/ subdirectory
- Add comprehensive root-level README.md (257 lines)
- Add .dockerignore files for optimized build contexts
- Enhance shell scripts with shebangs and documentation headers
- Update docker-compose.yml to build locally instead of pulling
- Add environment variables for GPU and host configuration
- Remove duplicate Dockerfile and confusing nested structure

New structure:
  docker/
  ├── README.md (comprehensive documentation)
  ├── docker-compose.yml (local build support)
  ├── builder/ (build environment: CUDA 11.4 + GCC 10 + Go 1.24)
  │   ├── Dockerfile
  │   ├── README.md
  │   ├── .dockerignore
  │   └── scripts/ (organized environment setup)
  └── runtime/ (production image)
      ├── Dockerfile
      ├── README.md
      └── .dockerignore

This reorganization eliminates confusion, removes duplication, and
provides a professional, maintainable structure for Tesla K80 builds.

docker/runtime/Dockerfile

@@ -0,0 +1,35 @@
+# ===== Stage 1: Build the source code =====
+FROM dogkeeper886/ollama37-builder AS builder
+
+# Copy source code and build
+COPY . /usr/local/src/ollama37
+WORKDIR /usr/local/src/ollama37
+RUN CC=/usr/local/bin/gcc CXX=/usr/local/bin/g++ cmake -B build \
+    && CC=/usr/local/bin/gcc CXX=/usr/local/bin/g++ cmake --build build -j$(nproc) \
+    && go build -o ollama .
+
+# ===== Stage 2: Runtime image =====
+FROM rockylinux/rockylinux:8
+
+RUN dnf -y update
+
+# Copy only the built binary and any needed assets from the builder stage
+COPY --from=builder /usr/local/src/ollama37 /usr/local/src/ollama37
+COPY --from=builder /usr/local/lib64 /usr/local/lib64
+COPY --from=builder /usr/local/cuda-11.4/lib64 /usr/local/cuda-11.4/lib64
+
+# Create a symbolic link from the built binary to /usr/local/bin for easy access
+RUN ln -s /usr/local/src/ollama37/ollama /usr/local/bin/ollama
+
+# Set environment variables
+ENV LD_LIBRARY_PATH="/usr/local/lib64:/usr/local/cuda-11.4/lib64"
+ENV NVIDIA_DRIVER_CAPABILITIES=compute,utility
+ENV NVIDIA_VISIBLE_DEVICES=all
+ENV OLLAMA_HOST=0.0.0.0:11434
+
+# Expose port
+EXPOSE 11434
+
+# Set entrypoint and command
+ENTRYPOINT ["/usr/local/bin/ollama"]
+CMD ["serve"]