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/storybook/.storybook/mocks/app/components/dialog-select-model.tsx

@@ -0,0 +1,7 @@
+import { splitProps } from "solid-js"
+
+export function ModelSelectorPopover(props: { triggerAs: any; triggerProps?: Record<string, unknown>; children: any }) {
+  const [local] = splitProps(props, ["triggerAs", "triggerProps", "children"])
+  const Trigger = local.triggerAs
+  return <Trigger {...(local.triggerProps ?? {})}>{local.children}</Trigger>
+}