feat: 品牌替换 + 启动优化 + AGENTS.md 模板定制

- 品牌替换：OpenCode/opencode → AirCoding/aircoding（16+ 文件）
- Logo ASCII art：修复 left/right 行数不匹配导致的启动崩溃
- 启动诊断：添加 OPENCODE_PRINT_TIMING 计时探针
- dev 模式默认 --pure 跳过外部插件加载
- AGENTS.md 模板：追加 AirCoding 多 Agent 专项段落
- architect prompt + plugin：强化 AGENTS.md 产出验证

packages/containers/bun-node/Dockerfile

@@ -0,0 +1,24 @@
+ARG REGISTRY=ghcr.io/anomalyco
+FROM ${REGISTRY}/build/base:24.04
+
+SHELL ["/bin/bash", "-lc"]
+
+ARG NODE_VERSION=24.4.0
+ARG BUN_VERSION=1.3.14
+
+ENV BUN_INSTALL=/opt/bun
+ENV PATH=/opt/bun/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+
+RUN set -euo pipefail; \
+  arch=$(uname -m); \
+  node_arch=x64; \
+  if [ "$arch" = "aarch64" ]; then node_arch=arm64; fi; \
+  curl -fsSL "https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-${node_arch}.tar.xz" \
+  | tar -xJf - -C /usr/local --strip-components=1; \
+  corepack enable
+
+RUN set -euo pipefail; \
+  curl -fsSL https://bun.sh/install | bash -s -- "bun-v${BUN_VERSION}"; \
+  bun --version; \
+  node --version; \
+  npm --version