Add development Dockerfile with extra tools (jq, git, python3, pip, bash)

This addresses PR #1304 concerns by:
- Keeping the main Dockerfile minimal for production use
- Creating a separate Dockerfile.dev for development/debugging scenarios
- Adding docker-compose service with 'dev' profile for optional use

The development image includes tools for scripting, JSON processing,
and debugging while maintaining the minimal image for resource-constrained
deployments.

docker/Dockerfile.dev

@@ -0,0 +1,53 @@
+# ============================================================
+# Development Dockerfile for PicoClaw
+# Includes additional tools (jq, git, python3, pip, bash)
+# for debugging, scripting, and development scenarios
+# ============================================================
+FROM golang:1.25-alpine AS builder
+
+RUN apk add --no-cache git make
+
+WORKDIR /src
+
+# Cache dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source and build
+COPY . .
+RUN make build
+
+# ============================================================
+# Development runtime image with additional tools
+# ============================================================
+FROM alpine:3.23
+
+RUN apk add --no-cache \
+  ca-certificates \
+  tzdata \
+  curl \
+  jq \
+  git \
+  python3 \
+  py3-pip \
+  bash
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget -q --spider http://localhost:18790/health || exit 1
+
+# Copy binary
+COPY --from=builder /src/build/picoclaw /usr/local/bin/picoclaw
+
+# Create non-root user and group
+RUN addgroup -g 1000 picoclaw && \
+    adduser -D -u 1000 -G picoclaw picoclaw
+
+# Switch to non-root user
+USER picoclaw
+
+# Run onboard to create initial directories and config
+RUN /usr/local/bin/picoclaw onboard
+
+ENTRYPOINT ["picoclaw"]
+CMD ["gateway"]

docker/docker-compose.yml

@@ -50,3 +50,22 @@ services:
       - "127.0.0.1:18790:18790"
     volumes:
       - ./data:/root/.picoclaw
+
+  # ─────────────────────────────────────────────
+  # PicoClaw Gateway (Development build with extra tools)
+  # Includes: jq, git, python3, pip, bash
+  #   docker compose -f docker/docker-compose.yml --profile dev up picoclaw-gateway-dev
+  # ─────────────────────────────────────────────
+  picoclaw-gateway-dev:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.dev
+    container_name: picoclaw-gateway-dev
+    restart: on-failure
+    profiles:
+      - dev
+    # Uncomment to access host network; leave commented unless needed.
+    #extra_hosts:
+    #  - "host.docker.internal:host-gateway"
+    volumes:
+      - ./data:/root/.picoclaw