Multi-site distribution readiness: settings-driven site config, security closeout, release engineering, v0.5.0

Make the app distributable to other GE Aerospace sites (one self-hosted
instance per site, ADR-004). GE values remain the shipped defaults; every
site-specific behavior is now a Setting an admin can change in the UI.

Settings-driven site config:
- Branding: site/QR/badge logos, favicon, primary color (upload endpoints
  mirror the map-blueprint pattern; new Settings > Branding section).
- ServiceNow: search/incident/change URL templates ({ticket}), ticket
  prefixes, enable toggle. Defaults point at the current
  geaerospaceqa.service-now.com global search. Disabled = plain-text tickets.
- Employee-id regex (employeeid_pattern), printer hostname template,
  QR label targets (qr_target_printer / qr_target_usb, blank = asset page,
  else URL template with placeholders), usb_label_style (barcode|qr).
- West Jefferson floor-plan PNGs removed from the tree; generic placeholder
  ships as the map default and sites upload their own blueprint.

Security closeout:
- dashboarddefaults writes now require admin.
- Collector: generic error messages (no str(exc) leak); API key accepted
  via X-API-Key header only (BREAKING: querystring api_key removed).
- IP-based login rate limiting (AUTH_RATELIMIT_* knobs) atop account lockout.
- Setting.set() creation race fixed (IntegrityError retry).

Release engineering and docs:
- __version__ 0.5.0 (distinct from __contract_version__, ADR-007),
  CHANGELOG.md, Gitea Actions CI config, frontend version aligned.
- One wizard-first install story across README/DEPLOY; new CONFIG.md,
  UPGRADE.md, BACKUP-RESTORE.md; CLAUDE.md and ROADMAP de-staled.
- Dockerfile multi-stage build now bundles the frontend; compose binds
  MySQL to 127.0.0.1; stale database/schema.sql and one-off SQL removed.

Debt and fixes:
- .query.get() -> db.session.get() sweep; datetime.utcnow() removed
  (naive-UTC via timezone-aware now); users.py on authz decorators.
- Fixed 4 stale tests (slides feed shape, shopfloor splitperemployee,
  plugin contract purity) and the USB label page field mapping (both usb
  modes emit the cmmc shape: device_id/device_desc).
- Health endpoint reports the real version.

248 tests pass; naming/style check green; frontend builds; fresh-DB
flask db upgrade + seeds verified; QR targets verified by decoding
rendered codes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/SetupWizard.vue

@@ -25,6 +25,12 @@
             <label>Site base URL <span class="hint">(blank = use the browsing origin)</span></label>
             <input v-model="form.site_base_url" type="url" class="form-control" placeholder="https://shopdb.example.net" />
           </div>
+          <div class="form-group">
+            <label>Site logo <span class="hint">(optional)</span></label>
+            <input type="file" accept="image/*" @change="uploadSiteLogo($event)" :disabled="logoUploading" />
+            <img v-if="siteLogo" :src="siteLogo" class="wizard-map-thumb" alt="site logo" />
+            <small class="hint">Skip to keep the shipped GE branding. You can change this later under Settings &gt; Branding.</small>
+          </div>
         </div>
 
         <!-- Plugins -->
@@ -187,6 +193,24 @@ const seedResult = ref('')
 const mapUploading = ref(false)
 const blueprintLight = ref('')
 const blueprintDark = ref('')
+const logoUploading = ref(false)
+const siteLogo = ref('')
+
+async function uploadSiteLogo(event) {
+  const file = event.target.files[0]
+  if (!file) return
+  logoUploading.value = true
+  try {
+    const { data } = await settingsApi.uploadBrandingLogo('site', file)
+    siteLogo.value = data?.data?.value || ''
+    toast.success('Logo uploaded')
+  } catch (err) {
+    toast.error(apiError(err, 'Upload failed'))
+  } finally {
+    logoUploading.value = false
+    event.target.value = ''
+  }
+}
 
 async function uploadBlueprint(theme, event) {
   const file = event.target.files[0]