Add LSP Dockerfiles for bash, docker, and marksman

- bash-language-server: Prebuilt npm package (190MB)
- docker-language-server: Multi-stage Go build (49.2MB)
- marksman: Debian with libicu72 for .NET runtime (144MB)
- All configured for Crush via stdio communication

dockerfiles/docker-language-server/Dockerfile

@@ -0,0 +1,32 @@
+# syntax=docker/dockerfile:1
+
+ARG GO_VERSION="1.25"
+ARG ALPINE_VERSION="3.22"
+
+FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS builder
+
+WORKDIR /src
+
+# Copy go files
+COPY go.mod go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build of binary
+RUN CGO_ENABLED=0 GOOS=linux go build -o docker-language-server ./cmd/docker-language-server
+
+# Runtime stage
+FROM alpine:${ALPINE_VERSION}
+
+WORKDIR /app
+
+# Copy binary from builder
+COPY --from=builder /src/docker-language-server /usr/local/bin/
+
+# Set entrypoint to run LSP server
+ENTRYPOINT ["docker-language-server"]
+CMD ["start", "--stdio"]