build: add frontend-builder image and bake buf into java-builder

ci/frontend-builder (new): Node 24 + pnpm 10 + buf 1.55 + global
@bufbuild/protoc-gen-es 2.4 + Playwright chromium runtime libs +
ORAS. Used by KollectAI-ETL frontend CI to run TS proto codegen
locally (buf.gen.yaml uses `local: protoc-gen-es`) instead of the
rate-limited BSR remote-plugin path.

ci/java-builder: added the standalone buf binary so `buf lint` runs
in CI without an inline curl install. Backend Java codegen stays in
the Maven build (protobuf-maven-plugin), so no protoc plugins are
added to this image.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ci/frontend-builder/Dockerfile

@@ -0,0 +1,91 @@
+# KollectAI CI - Frontend Builder Image
+#
+# Pre-baked build environment for SvelteKit frontend CI jobs and
+# protobuf TypeScript code generation.
+# Contains: Node.js, pnpm, buf CLI, @bufbuild/protoc-gen-es plugin
+# (global so buf 'local: protoc-gen-es' resolves via PATH), Playwright
+# system deps, ORAS CLI, common build tools.
+#
+# Build:
+#   docker build -t 192.168.1.72/kollect-tools/ci/frontend-builder:latest ci/frontend-builder/
+#
+# Usage in CI:
+#   container:
+#     image: 192.168.1.72/kollect-tools/ci/frontend-builder:latest
+
+ARG NODE_MAJOR=24
+FROM node:${NODE_MAJOR}-bookworm-slim
+
+ARG PNPM_VERSION=10.15.0
+ARG BUF_VERSION=1.55.0
+# Pin protoc-gen-es to a known-good major. Bump in lockstep with the
+# frontend's @bufbuild/protobuf runtime version in package.json.
+ARG PROTOC_GEN_ES_VERSION=2.4.0
+ARG ORAS_VERSION=1.2.2
+
+# ─────────────────────────────────────────────────────────────────────
+# System dependencies
+#
+# The Playwright system libs (libnss3 ... libasound2) are pre-installed
+# so test-e2e jobs can skip `playwright install --with-deps` and just
+# run `playwright install chromium` (browser binary still cached at
+# ~/.cache/ms-playwright in CI). Saves ~30s per E2E run.
+# ─────────────────────────────────────────────────────────────────────
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        ca-certificates \
+        curl \
+        git \
+        jq \
+        unzip \
+        # Playwright chromium runtime libs
+        libasound2 \
+        libatk1.0-0 \
+        libatk-bridge2.0-0 \
+        libcups2 \
+        libdbus-1-3 \
+        libdrm2 \
+        libgbm1 \
+        libnspr4 \
+        libnss3 \
+        libxcomposite1 \
+        libxdamage1 \
+        libxfixes3 \
+        libxkbcommon0 \
+        libxrandr2 \
+    && rm -rf /var/lib/apt/lists/*
+
+# ─────────────────────────────────────────────────────────────────────
+# pnpm via corepack (ships with Node.js)
+# ─────────────────────────────────────────────────────────────────────
+RUN corepack enable \
+    && corepack prepare "pnpm@${PNPM_VERSION}" --activate
+
+# ─────────────────────────────────────────────────────────────────────
+# buf CLI - single static binary, used for `buf lint` and `buf generate`
+# ─────────────────────────────────────────────────────────────────────
+RUN curl -fsSL "https://github.com/bufbuild/buf/releases/download/v${BUF_VERSION}/buf-Linux-x86_64" \
+        -o /usr/local/bin/buf \
+    && chmod +x /usr/local/bin/buf
+
+# ─────────────────────────────────────────────────────────────────────
+# protoc-gen-es - TypeScript codegen plugin for buf 'local:' references.
+# Installed globally so it lands on PATH; buf v2 resolves
+# `local: protoc-gen-es` via PATH lookup.
+# ─────────────────────────────────────────────────────────────────────
+RUN npm install -g "@bufbuild/protoc-gen-es@${PROTOC_GEN_ES_VERSION}"
+
+# ─────────────────────────────────────────────────────────────────────
+# ORAS CLI - for uploading artifacts (test reports, audit logs) to Harbor
+# ─────────────────────────────────────────────────────────────────────
+RUN curl -fsSL "https://github.com/oras-project/oras/releases/download/v${ORAS_VERSION}/oras_${ORAS_VERSION}_linux_amd64.tar.gz" \
+    | tar -xz -C /usr/local/bin oras
+
+WORKDIR /workspace
+
+# Verify installation
+RUN node --version \
+    && pnpm --version \
+    && buf --version \
+    && protoc-gen-es --version \
+    && oras version \
+    && jq --version