feat: graduate Host Console to Community admins (#1669)

* feat: graduate Host Console to Community admins

Make Host Console available to Community and Admiral admins (system:console), add host-console-community for mixed fleets, and keep opaque API tokens off the host shell.

* docs: document Host Console deep links

Cover root and stack-scoped Console URLs, correct the phone treatment note, and pin parse/build round-trips in senchoRoute tests.

* fix: bind Host Console socket to the resolved node

Treat unresolved activeNode as loading, target the WebSocket with an explicit nodeId, and wait for stack deep-link hydration so the shell cannot open on the wrong node or compose root. Add regression coverage for node/stack retargeting and fail-closed directory resolution.

* fix: harden Host Console node binding, audit acting_as, and console_session tokens

Reject unknown or malformed nodeIds before spawning a PTY. Record hub operators in audit_log.acting_as for remote console_session bridges. Path-scope and one-time-consume console_session JWTs so Host Console mints cannot open container exec or be replayed.

* test: expect acting_as in audit CSV export header

Align the CSV export assertion with the P0-2B acting_as column added to audit log exports.

backend/src/__tests__/audit-log.test.ts

@@ -715,7 +715,7 @@ describe('GET /api/audit-log/export', () => {
 
     const csvText = res.text;
     const lines = csvText.split('\n');
-    expect(lines[0]).toBe('id,timestamp,username,method,path,status_code,node_id,ip_address,summary');
+    expect(lines[0]).toBe('id,timestamp,username,acting_as,method,path,status_code,node_id,ip_address,summary');
     expect(lines.length).toBeGreaterThan(1);
   });