feat(brand): BRAND_* env scheme — instance branding without a rebuild

Replace baked-in UOM/MysticMoon/UOMysticmoon branding with a BRAND_* env
scheme so one prebuilt image runs as any shard; UOMysticmoon becomes the
first tenant that sets these vars rather than a special case in the code.

Architecture (chosen because the app ships as a prebuilt image):
- server/src/config/brand.js + bot/src/brand.js read BRAND_* once at boot,
  with Runic Gateway defaults.
- Text/colors reach the SPA at RUNTIME through the existing public settings
  API (settings.model.getPublic -> SiteContext), so no client rebuild. The
  admin-editable site title + contact email still override BRAND_NAME/email.
- SiteContext applies BRAND_ACCENT_COLOR to the --accent CSS var at runtime.
- Express templates the built index.html <title>/description/OG/favicon at
  serve time from BRAND_* (renderIndexHtml in app.js).
- Server-side consumers read brand directly: emails, TOTP issuer, API docs,
  boot logs, HTML error page. Bot uses it for embed color + logs.

Assets: logo/hero/favicon delivered from a ./brand:/app/brand bind-mount
(BRAND_LOGO/HERO/FAVICON), with neutral defaults baked in; hero falls back
to a built-in image when unset.

Scope: also genericized package.json names (uomysticmoon-* -> runic-gateway-*)
and the DB_NAME/DB_USER/COOKIE_NAME code defaults (runic_gateway/runic/
rg_token). Production keeps its real values by pinning them in .env — see
.env.uomysticmoon.example, which reproduces the exact UOMysticmoon identity
(proof the substitution works). Changing a deployed COOKIE_NAME invalidates
existing sessions, so UOMysticmoon pins uomm_token.

Verified: 193 server tests pass, client builds, app.js loads + templates the
built index.html, brand transform injects title/description/OG/favicon.

client/src/routes/admin/views/EmailDelivery.jsx

@@ -1,5 +1,6 @@
 import { useCallback, useEffect, useState } from 'react'
 import { api } from '../../../api/client.js'
+import { useSite } from '../../../contexts/SiteContext.jsx'
 
 // Email delivery panel (Gmail over OAuth2), rendered as a section on the Settings
 // page. Sending is authorized by an in-app "Connect Gmail" consent flow that
@@ -52,6 +53,7 @@ function StatusPanel({ config }) {
 }
 
 export default function EmailDelivery() {
+  const { siteTitle } = useSite()
   const [config, setConfig] = useState(null)
   const [error, setError] = useState('')
   const [senderName, setSenderName] = useState('')
@@ -213,7 +215,7 @@ export default function EmailDelivery() {
               onChange={(e) => setSenderName(e.target.value)}
               className="input"
               autoComplete="off"
-              placeholder="UOMysticmoon"
+              placeholder={siteTitle}
             />
           </label>