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

sst.config.ts

@@ -0,0 +1,53 @@
+/// <reference path="./.sst/platform/config.d.ts" />
+
+export default $config({
+  app(input) {
+    return {
+      name: "opencode",
+      removal: input?.stage === "production" ? "retain" : "remove",
+      protect: ["production"].includes(input?.stage),
+      home: "cloudflare",
+      providers: {
+        aws: {
+          version: "7.30.0",
+          region: "us-east-1",
+          profile: process.env.GITHUB_ACTIONS
+            ? undefined
+            : input.stage === "production"
+              ? "opencode-production"
+              : "opencode-dev",
+        },
+        stripe: {
+          version: "0.0.28",
+          apiKey: process.env.STRIPE_SECRET_KEY!,
+        },
+        random: "4.19.2",
+        planetscale: "0.4.1",
+        honeycomb: "0.49.0",
+      },
+    }
+  },
+  async run() {
+    const stage = await import("./infra/stage.js")
+    await import("./infra/app.js")
+    const lake = stage.deployAws ? await import("./infra/lake.js") : undefined
+    const stats = stage.deployAws ? await import("./infra/stats.js") : undefined
+    const { stat } = await import("./infra/console.js")
+    await import("./infra/enterprise.js")
+    if ($app.stage === "production" || $app.stage === "vimtor") {
+      await import("./infra/monitoring.js")
+    }
+
+    return {
+      StatWorkerUrl: stat.url,
+      ...(stats ? { StatsUrl: stats.app.url } : {}),
+      ...(lake
+        ? {
+            LakeUrl: lake.lakeIngest.properties.url,
+            LakeSecretSsm: lake.ingestSecretSsm.name,
+          }
+        : {}),
+      AwsStage: stage.awsStage,
+    }
+  },
+})