feat: add auth extension points and one ssh connect pipeline

plugins/ai/src/backend/index.ts

@@ -1,8 +1,11 @@
 import type { PluginContext } from "@termix/plugin-sdk/backend";
+import { setPluginSsh } from "./ssh.js";
 import { startAiService, stopAiService } from "./routes.js";
 import { createCurrentAiRepository } from "../../../../src/backend/database/repositories/factory.js";
 
 export async function activate(ctx: PluginContext) {
+  setPluginSsh(ctx.ssh);
+  ctx.disposables.add(() => setPluginSsh(null));
   startAiService(ctx.http.router());
 
   // Offered by reference, not copied: this hands over a resolver, so the key