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/services/HostTerminalService.ts

@@ -18,6 +18,8 @@ export interface ConsoleAuditContext {
     // path always supplies a concrete id.
     readonly nodeId: number | null;
     readonly ipAddress: string;
+    /** Hub operator for remote console_session bridges; null for direct sessions. */
+    readonly actingAs?: string | null;
 }
 
 const CONSOLE_AUDIT_PATH = '/api/system/host-console';
@@ -97,6 +99,7 @@ export class HostTerminalService {
                 node_id: audit.nodeId,
                 ip_address: audit.ipAddress,
                 summary,
+                acting_as: audit.actingAs ?? null,
             });
         } catch (err) {
             console.error('[HostConsole] Failed to write session audit log:', err);