Add serve mode, fix binary tags, document CLI tools, improve Docker

- Add 'serve' subcommand for ephemeral RAM-based relay at /dev/shm with
  open ACL mode for testing and benchmarking
- Fix e-tag and p-tag decoding to use ValueHex()/ValueBinary() methods
  instead of Value() which returns raw bytes for binary-optimized storage
- Document all command-line tools in readme.adoc (relay-tester, benchmark,
  stresstest, blossomtest, aggregator, convert, FIND, policytest, etc.)
- Switch Docker images from Alpine to Debian for proper libsecp256k1
  Schnorr signature and ECDH support required by Nostr
- Upgrade Docker Go version from 1.21 to 1.25
- Add ramdisk mode (--ramdisk) to benchmark script for eliminating disk
  I/O bottlenecks in performance measurements
- Add docker-compose.ramdisk.yml for tmpfs-based benchmark volumes
- Add test coverage for privileged policy with binary-encoded p-tags
- Fix blossom test to expect 200 OK for anonymous uploads when auth is
  not required (RequireAuth=false with ACL mode 'none')
- Update follows ACL to handle both binary and hex p-tag formats
- Grant owner access to all users in serve mode via None ACL
- Add benchmark reports from multi-relay comparison run
- Update CLAUDE.md with binary tag handling documentation
- Bump version to v0.30.2

Dockerfile.relay-tester

@@ -1,9 +1,10 @@
 # Dockerfile for relay-tester
 
-FROM golang:1.21-alpine AS builder
+# Use Debian-based Go image to match runtime stage (avoids musl/glibc linker mismatch)
+FROM golang:1.25-bookworm AS builder
 
 # Install build dependencies
-RUN apk add --no-cache git
+RUN apt-get update && apt-get install -y --no-install-recommends git && rm -rf /var/lib/apt/lists/*
 
 # Set working directory
 WORKDIR /build
@@ -19,12 +20,19 @@ COPY . .
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o relay-tester ./cmd/relay-tester
 
 # Runtime stage
-FROM alpine:latest
+# Use Debian slim instead of Alpine because Debian's libsecp256k1 includes
+# Schnorr signatures (secp256k1_schnorrsig_*) and ECDH which Nostr requires.
+# Alpine's libsecp256k1 is built without these modules.
+FROM debian:bookworm-slim
 
-RUN apk add --no-cache ca-certificates
+# Install runtime dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ca-certificates libsecp256k1-1 && \
+    rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
+# Copy binary (libsecp256k1.so.1 is already installed via apt)
 COPY --from=builder /build/relay-tester /app/relay-tester
 
 # Default relay URL (can be overridden)