website: generate the API reference from source (cordis + all 15 harness services)

scripts/gen-website-api.ts renders website/zh-CN/api/{cordis,harness}/* and the
api-sidebar.json fragment the VitePress config imports, so pages and navigation
can never drift from the code: signatures, @param/@returns prose, dispatch
modes, and GitHub source links are extracted, never transcribed, and the
generator hard-errors on any rendered member missing docs. verify-website-api
(doc-sync + run-gates) is the freshness gate.

Replaces the hand-written zh api pages (7 pages covering 7 of 15 services,
with phantom APIs: Context.current/Context.events, agent/post-step, tool/call,
compact/*, llm/pre-request none of which exist) with generated English
references: 5 cordis pages, 15 per-service pages, and a 35-event catalog
grouped by scope. The hand-written hub api/index.md stays and now indexes the
full surface; zh for these pages arrives with the unified translation flow.

website/.vitepress/config/api-sidebar.json

@@ -0,0 +1,90 @@
+{
+  "cordis": [
+    {
+      "text": "Context",
+      "link": "/zh-CN/api/cordis/context"
+    },
+    {
+      "text": "Events",
+      "link": "/zh-CN/api/cordis/events"
+    },
+    {
+      "text": "Fiber",
+      "link": "/zh-CN/api/cordis/fiber"
+    },
+    {
+      "text": "Registry",
+      "link": "/zh-CN/api/cordis/registry"
+    },
+    {
+      "text": "Service",
+      "link": "/zh-CN/api/cordis/service"
+    }
+  ],
+  "harness": [
+    {
+      "text": "ctx.agentLoop",
+      "link": "/zh-CN/api/harness/agent-loop"
+    },
+    {
+      "text": "ctx.agents",
+      "link": "/zh-CN/api/harness/agents"
+    },
+    {
+      "text": "ctx.bash",
+      "link": "/zh-CN/api/harness/bash"
+    },
+    {
+      "text": "ctx.codeRuntime",
+      "link": "/zh-CN/api/harness/code-runtime"
+    },
+    {
+      "text": "ctx.compact",
+      "link": "/zh-CN/api/harness/compact"
+    },
+    {
+      "text": "ctx.fs",
+      "link": "/zh-CN/api/harness/fs"
+    },
+    {
+      "text": "ctx.llm",
+      "link": "/zh-CN/api/harness/llm"
+    },
+    {
+      "text": "ctx.sessionPersistence",
+      "link": "/zh-CN/api/harness/session-persistence"
+    },
+    {
+      "text": "ctx.sessions",
+      "link": "/zh-CN/api/harness/sessions"
+    },
+    {
+      "text": "ctx.subagents",
+      "link": "/zh-CN/api/harness/subagents"
+    },
+    {
+      "text": "ctx.systemPrompt",
+      "link": "/zh-CN/api/harness/system-prompt"
+    },
+    {
+      "text": "ctx.tools",
+      "link": "/zh-CN/api/harness/tools"
+    },
+    {
+      "text": "ctx.userInteraction",
+      "link": "/zh-CN/api/harness/user-interaction"
+    },
+    {
+      "text": "ctx.web",
+      "link": "/zh-CN/api/harness/web"
+    },
+    {
+      "text": "ctx.workflows",
+      "link": "/zh-CN/api/harness/workflows"
+    },
+    {
+      "text": "Events",
+      "link": "/zh-CN/api/harness/events"
+    }
+  ]
+}