feat(hub): provider-agnostic agent seam 骨架(ADR-0001/0003/0017)

hub/ TS 新部件,平级于 spec/。本仓从零 TS 重写(非迁移旧服务),栈:
Fastify+Prisma 待补;本提交落 provider-agnostic agent runtime 骨架:
- provider.ts: AgentProvider seam,OpenAI-compatible messages+tools+tool_calls
  形状(语言通解,非 OpenAI 承诺);@Claude 仅为触发品牌(ADR-0017)
- openrouter-provider.ts: openai SDK 指向 OpenRouter 的具体适配器,仅做
  Message↔SDK 翻译;agent loop 不 import SDK,换 provider 不改 loop
- runner.ts: 自有 agent loop(dispatch tools/循环到 stop/budget),per-run
  model(ADR-0017 role-based routing,run 带其 model)
- tools.ts: 窄工具面 + ADR-0003 McpReadRequest.Authorized 落代码:
  feishu_read_context 拒绝非本项目绑定 chat 的读取(实测错 chat 抛
  UnauthorizedChatRead,对 chat 放行)
- models.ts: ModelRegistry seam(role→default 映射策略 OPEN)
- server.ts: 接线入口(stub Feishu read,无活凭证即可编译)
tsc --noEmit rc=0;ADR-0003 不变式 smoke 通过。

hub/tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2023"],
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "rootDir": "src",
+    "outDir": "dist",
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "exactOptionalPropertyTypes": true,
+    "noImplicitOverride": true,
+    "noFallthroughCasesInSwitch": true,
+    "verbatimModuleSyntax": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": false,
+    "sourceMap": true
+  },
+  "include": ["src/**/*.ts"]
+}