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

.opencode/command/translate.md

@@ -0,0 +1,14 @@
+---
+description: translate English to other languages
+model: opencode/claude-opus-4-8
+---
+
+run git diff and translate changed english doc and UI copy files to other international languages. Translate all languages in parallel to save time.
+
+Requirements:
+
+- Preserve meaning, intent, tone, and formatting (including Markdown/MDX structure).
+- Preserve all technical terms and artifacts exactly: product/company names, API names, identifiers, code, commands/flags, file paths, URLs, versions, error messages, config keys/values, and anything inside inline code or code blocks.
+- Also preserve every term listed in the Do-Not-Translate glossary below.
+- Also apply locale-specific guidance from `.opencode/glossary/<locale>.md` when available (for example, `zh-cn.md`).
+- Do not modify fenced code blocks.