fix(cli): import all model modules so SA relationship resolution works

hf-cli admin list crashed on prod with `KeyError: 'Agent'` because the CLI
bypassed main.py's startup() which is the only place that imports every
model module — User has a relationship target (`Agent`) that SQLAlchemy
can't resolve unless its module is imported. Load them all up front in
__main__.py (mirrors the main.py import block).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/cli/__main__.py

@@ -2,6 +2,26 @@
 import sys
 
 
+def _load_all_models() -> None:
+    """Import every model module so SQLAlchemy's declarative registry
+    resolves cross-table relationships (e.g. User.role, User.agent).
+
+    main.py's startup() does the same thing for the web server; the CLI
+    skips startup() but still queries User → would otherwise hit
+    `KeyError: 'Agent'` when SA tries to resolve relationship targets.
+    Keep this list in sync with main.py's startup import list.
+    """
+    from app.models import (  # noqa: F401
+        models, webhook, apikey, activity, milestone, notification, worklog,
+        monitor, role_permission, task, support, meeting, proposal, propose,
+        essential, agent, calendar, minimum_workload, schedule_type,
+        schedule_type_special_slot, oidc_settings,
+    )
+
+
+_load_all_models()
+
+
 USAGE = """Usage:
   hf-cli admin create-user --email <e> [--username <u>] [--full-name <n>]
                            [--password <p>] [--oidc-issuer <url> --oidc-subject <sub>]