Users, file manager, image generation, budgets and agent workflow

- User management: local accounts (Argon2) and OpenID Connect, admin/user
  roles, per-user folders plus admin-shared folders, read-only session
  sharing, event filtering per user
- File manager with CodeMirror editor and git client (status, diff,
  stage, commit, branches, fetch/pull/push, log, clone/init)
- Image generation via fal.ai: generate_image tool and image page
- Budgets: monthly limits per provider, provider balances/costs
  (OpenRouter, Anthropic admin cost report, fal.ai), price discovery
- Subagents on other models, background tasks, concurrency limits per
  host/model/subagent
- MCP tools loaded on demand (mcp_search/mcp_call), read-only hints
- Permission mode "auto", safe read-only commands always allowed
- Persistent message queue with attachments, deletable
- Live reasoning incl. <think> tags, activity animations, CSS themes,
  mobile layout, statistics per user, upload size handling
- Docker: named volume for state, localhost-bound port

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/components/ModelSelect.tsx

@@ -1,11 +1,12 @@
 import { useModels, modelOptions } from "../hooks";
 
 /** Model picker; keeps unknown current values selectable. */
-export function ModelSelect({ value, onChange, title }: { value: string; onChange: (v: string) => void; title?: string }) {
+export function ModelSelect({ value, onChange, title, emptyLabel }: { value: string; onChange: (v: string) => void; title?: string; emptyLabel?: string }) {
   const options = modelOptions(useModels());
   const known = options.some((o) => o.value === value);
   return (
     <select value={value} onChange={(e) => onChange(e.target.value)} title={title}>
+      {emptyLabel !== undefined && <option value="">{emptyLabel}</option>}
       {!known && value && <option value={value}>{value}</option>}
       {options.map((o) => (
         <option key={o.value} value={o.value}>